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curriculum/challenges/italian/10-coding-interview-prep/project-euler/problem-161-triominoes.md

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+---
+id: 5900f40d1000cf542c50ff20
+title: 'Problem 161: Triominoes'
+challengeType: 5
+forumTopicId: 301795
+dashedName: problem-161-triominoes
+---
+
+# --description--
+
+A triomino is a shape consisting of three squares joined via the edges.
+
+There are two basic forms:
+
+If all possible orientations are taken into account there are six:
+
+Any n by m grid for which nxm is divisible by 3 can be tiled with triominoes. If we consider tilings that can be obtained by reflection or rotation from another tiling as different there are 41 ways a 2 by 9 grid can be tiled with triominoes:
+
+In how many ways can a 9 by 12 grid be tiled in this way by triominoes?
+
+# --hints--
+
+`euler161()` should return 20574308184277972.
+
+```js
+assert.strictEqual(euler161(), 20574308184277972);
+```
+
+# --seed--
+
+## --seed-contents--
+
+```js
+function euler161() {
+
+  return true;
+}
+
+euler161();
+```
+
+# --solutions--
+
+```js
+// solution required
+```