A030226 Number of n-celled polyhexes (hexagonal polyominoes) without bilateral symmetry.

0, 0, 0, 3, 11, 65, 287, 1373, 6370, 30149, 142638, 681520, 3270604, 15789461, 76562081, 372832744, 1822142769, 8934740804, 43938715224, 216650217219, 1070791145115, 5303851997213, 26323053574543, 130878372709130, 651812928565763, 3251215398061949, 16240020484212325, 81227147300622466, 406770969577924068, 2039375196443918387

Offset

1,4

Links

John Mason, Table of n, a(n) for n = 1..36

Crossrefs

Cf. A000228, A030225.

Sequence in context: A292792 A199135 A096655 * A309174 A233099 A372395

Adjacent sequences: A030223 A030224 A030225 * A030227 A030228 A030229

Keyword

nonn

Author

David W. Wilson

Extensions

More terms from Joseph Myers, Sep 21 2002

a(21)-a(30) from John Mason, Jul 18 2023

Status

approved