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
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
KEYWORD
nonn,more
AUTHOR
Douglas A. Torrance, May 25 2019
STATUS
approved