A055919 Number of directed site animals on hexagonal net (honeycomb) with n sites.

2, 4, 10, 24, 60, 152, 402, 1094, 3012, 8232, 22086

Offset

1,1

Links

Table of n, a(n) for n=1..11.

A. J. Guttmann, Indicators of solvability for lattice models, Discrete Math., 217 (2000), 167-189.

A. J. Guttmann and A. R. Conway, Hexagonal lattice directed site animals, Statistical Physics on the Eve of the Twenty-First Century, ed. M. T. Batchelor, World Scientific, 1999.

Crossrefs

Row sums of A055907.

Sequence in context: A291419 A088354 A329673 * A006575 A307900 A230551

Adjacent sequences: A055916 A055917 A055918 * A055920 A055921 A055922

Keyword

nonn,more

Author

Christian G. Bower, Jun 22 2000

Extensions

Name edited by Andrey Zabolotskiy, Jun 21 2022

Status

approved