A038302 Triangle whose (i,j)-th entry is binomial(i,j)*9^(i-j)*12^j.

1, 9, 12, 81, 216, 144, 729, 2916, 3888, 1728, 6561, 34992, 69984, 62208, 20736, 59049, 393660, 1049760, 1399680, 933120, 248832, 531441, 4251528, 14171760, 25194240, 25194240, 13436928, 2985984, 4782969, 44641044, 178564176

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.

Links

Table of n, a(n) for n=0..30.

Mathematica

Table[Binomial[i, j]9^(i-j) 12^j, {i, 0, 10}, {j, 0, i}]//Flatten (* Harvey P. Dale, Jan 19 2024 *)

Crossrefs

Sequence in context: A072308 A140145 A166643 * A246916 A188001 A273614

Adjacent sequences: A038299 A038300 A038301 * A038303 A038304 A038305

Keyword

nonn,tabl,easy

Author

N. J. A. Sloane.

Status

approved