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A319326
a(n) is the number of column convex polyglasses (polyiamonds which need only touch at corners) with n cells.
2
2, 12, 84, 612, 4532, 33762, 252106, 1884120, 14084674, 105295512, 787178752
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OFFSET
1,1
COMMENTS
A polyglass is column convex if the intersection of its interior with any vertical line through the centers of the cells is connected.
LINKS
Table of n, a(n) for n=1..11.
Adam Gruber, Java program to count lattice animals.
EXAMPLE
There are four triglasses that are not column convex. So a(2) = A319324(3) - 4 = 84.
CROSSREFS
Cf. A319324 (fixed polyglasses), A319325 (row convex polyglasses), A319323 (column convex polyiamonds).
Sequence in context: A355378 A136278 A130464 * A214765 A006657 A105927
Adjacent sequences: A319323 A319324 A319325 * A319327 A319328 A319329
KEYWORD
nonn,more
AUTHOR
David Bevan, Sep 27 2018
STATUS
approved

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Last modified October 5 10:13 EDT 2024. Contains 376540 sequences.
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