A038275 Triangle whose (i,j)-th entry is binomial(i,j)*7^(i-j)*9^j.

1, 7, 9, 49, 126, 81, 343, 1323, 1701, 729, 2401, 12348, 23814, 20412, 6561, 16807, 108045, 277830, 357210, 229635, 59049, 117649, 907578, 2917215, 5000940, 4822335, 2480058, 531441, 823543, 7411887, 28588707, 61261515

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..31.

Crossrefs

Sequence in context: A067649 A025631 A258183 * A261669 A299913 A226197

Adjacent sequences: A038272 A038273 A038274 * A038276 A038277 A038278

Keyword

nonn,tabl,easy

Author

N. J. A. Sloane.

Status

approved