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A308409 Number of bond trees with n bonds on the square lattice. 1
1, 2, 6, 22, 87, 364, 1574, 6986, 31581, 144880, 672390, 3150362, 14877317, 70726936, 338158676 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

a(n-1) is the number of bond trees with n sites (vertices) on the square lattice.

a(n) is the number of fixed polyedges (A096267) with n edges and no cycles.

LINKS

Table of n, a(n) for n=0..14.

D. S. Gaunt et al., Universality in branched polymers on d-dimensional hypercubic lattices, Journal of Physics A: Mathematical and General 15.10 (1982): 3209.

Douglas A. Torrance, Enumeration of planar Tangles, arXiv:1906.01541 [math.CO], 2019. See Table 4.1 (A).

S. G. Whittington, G. M. Torrie, and D. S. Gaunt, Branched polymers with a prescribed number of cycles, Journal of Physics A: Mathematical and General 16.8 (1983): 1695.

CROSSREFS

Sequence in context: A164651 A279566 A150261 * A150262 A101043 A101046

Adjacent sequences:  A308406 A308407 A308408 * A308410 A308411 A308412

KEYWORD

nonn,more

AUTHOR

Douglas A. Torrance, May 25 2019

STATUS

approved

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Last modified November 29 23:27 EST 2020. Contains 338780 sequences. (Running on oeis4.)