OFFSET
0,2
LINKS
Robert Israel, Table of n, a(n) for n = 0..10010 (rows 0 to 140, flattened)
B. N. Cyvin et al., Isomer enumeration of unbranched catacondensed polygonal systems with pentagons and heptagons, Match, No. 34 (Oct 1996), pp. 109-121.
FORMULA
G.f. as triangle: 1/(1-x*(10*y+12)). - Robert Israel, Apr 30 2019
MAPLE
seq(seq(binomial(i, j)*12^(i-j)*10^j, j=0..i), i=0..15); # Robert Israel, Apr 30 2019
MATHEMATICA
Table[Binomial[n, k]12^(n-k) 10^k, {n, 0, 10}, {k, 0, n}]//Flatten (* Harvey P. Dale, Aug 26 2021 *)
CROSSREFS
AUTHOR
STATUS
approved