A038269 Triangle whose (i,j)-th entry is binomial(i,j)*7^(i-j)*3^j.

1, 7, 3, 49, 42, 9, 343, 441, 189, 27, 2401, 4116, 2646, 756, 81, 16807, 36015, 30870, 13230, 2835, 243, 117649, 302526, 324135, 185220, 59535, 10206, 729, 823543, 2470629, 3176523, 2268945, 972405, 250047, 35721, 2187, 5764801

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..36.

Crossrefs

Sequence in context: A194778 A272010 A145758 * A176328 A248279 A372617

Adjacent sequences: A038266 A038267 A038268 * A038270 A038271 A038272

Keyword

nonn,tabl,easy

Author

N. J. A. Sloane.

Status

approved