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Search: a319323 -id:a319323
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A319326
a(n) is the number of column convex polyglasses (polyiamonds which need only touch at corners) with n cells.
+10
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).
KEYWORD
nonn,more
AUTHOR
David Bevan, Sep 27 2018
STATUS
approved
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Last modified October 21 06:37 EDT 2024. Contains 376969 sequences.
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