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A066158 Number of fixed polyominoes with n cells and tree-like structure. +0
2
1, 2, 6, 18, 55, 174, 570, 1908, 6473, 22202, 76886, 268352, 942651, 3329608, 11817582, 42120340, 150682450, 540832274, 1946892842 (list; graph; listen)
OFFSET

1,2

COMMENT

Computed by a modified version of the program used for A065068.

Added a(18) and a(19) from Madras et al. - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Apr 08 2006

REFERENCES

N. Madras, C. E. Soteros, S. G. Whittington, J. L. Martin, M. F. Sykes et al., The free energy of a collapsing branched polymer, J. Phys. A: Math. Gen. 23 (1990) 5327-5350

CROSSREFS

Cf. A001168.

Sequence in context: A004529 A000778 A006725 this_sequence A002999 A091142 A111961

Adjacent sequences: A066155 A066156 A066157 this_sequence A066159 A066160 A066161

KEYWORD

nonn

AUTHOR

Jan Kristian Haugland (jankrihau(AT)hotmail.com), Dec 13 2001

EXTENSIONS

More terms from R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Apr 08 2006

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Last modified August 19 23:53 EDT 2008. Contains 142930 sequences.


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