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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 (list; graph; refs; listen; history; text; internal format)
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: A052864 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 May 28 15:04 EDT 2022. Contains 354115 sequences. (Running on oeis4.)