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A068091 Number of board-pair-pile hexagonal polyominoes with n cells. 0
1, 3, 11, 44, 186, 814, 3648, 16611, 76437, 354112, 1647344, 7682237, 35873310, 167625690, 783470179, 3662035980, 17115684065, 79986841677, 373759118882, 1746296080947 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..20.

Moa Apagodu, Counting Hexagonal Lattice Animals.

Moa Apagodu, Counting Hexagonal Lattice Animals Using Umbral-Transfer-Matrix Method

MAPLE

The sequence is generated by a Maple program that accompanies the paper "Counting Hexagonal Lattice Animals using Umbral-Transfer-Matrix Method (UTMM)"

CROSSREFS

Cf. A001170.

Sequence in context: A167012 A167013 A121220 * A001207 A319156 A026887

Adjacent sequences:  A068088 A068089 A068090 * A068092 A068093 A068094

KEYWORD

hard,nonn

AUTHOR

Moa Apagodu, Mar 22 2002 and Oct 31 2002

STATUS

approved

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Last modified November 20 18:21 EST 2019. Contains 329337 sequences. (Running on oeis4.)