OFFSET
0,2
REFERENCES
B. N. Cyvin et al., Isomer enumeration of unbranched catacondensed polygonal systems with pentagons and heptagons, Match, No. 34 (Oct 1996), pp. 109-121.
EXAMPLE
1
12 9
144 216 81
1728 3888 2916 729
20736 62208 69984 34992 6561
248832 933120 1399680 1049760 393660 59049
2985984 13436928 25194240 25194240 14171760 4251528 531441
MAPLE
MATHEMATICA
Flatten[Table[Binomial[i, j]12^(i-j) 9^j, {i, 0, 10}, {j, 0, i}]] (* Harvey P. Dale, Oct 17 2013 *)
CROSSREFS
KEYWORD
AUTHOR
STATUS
approved