A038239 Triangle whose (i,j)-th entry is binomial(i,j)*4^(i-j)*9^j.

1, 4, 9, 16, 72, 81, 64, 432, 972, 729, 256, 2304, 7776, 11664, 6561, 1024, 11520, 51840, 116640, 131220, 59049, 4096, 55296, 311040, 933120, 1574640, 1417176, 531441, 16384, 258048, 1741824, 6531840, 14696640, 19840464, 14880348

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..34.

Crossrefs

Sequence in context: A030075 A296111 A038784 * A352919 A263094 A226354

Adjacent sequences: A038236 A038237 A038238 * A038240 A038241 A038242

Keyword

nonn,tabl,easy

Author

N. J. A. Sloane.

Status

approved