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This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

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A319326 a(n) is the number of column convex polyglasses (polyiamonds which need only touch at corners) with n cells.

Original entry on oeis.org

2, 12, 84, 612, 4532, 33762, 252106, 1884120, 14084674, 105295512, 787178752
Offset: 1

Views

Author

David Bevan, Sep 27 2018

Keywords

Comments

A polyglass is column convex if the intersection of its interior with any vertical line through the centers of the cells is connected.

Examples

			There are four triglasses that are not column convex. So a(2) = A319324(3) - 4 = 84.

Links

Crossrefs

Cf. A319324 (fixed polyglasses), A319325 (row convex polyglasses), A319323 (column convex polyiamonds).
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