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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
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.
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
KEYWORD
nonn,more
AUTHOR
David Bevan, Sep 27 2018
STATUS
approved