A038260 Triangle read by rows: T(n,k) = binomial(n,k)*6^(n-k)*6^k, 0<=k<=n.

1, 6, 6, 36, 72, 36, 216, 648, 648, 216, 1296, 5184, 7776, 5184, 1296, 7776, 38880, 77760, 77760, 38880, 7776, 46656, 279936, 699840, 933120, 699840, 279936, 46656, 279936, 1959552, 5878656, 9797760, 9797760, 5878656, 1959552, 279936, 1679616

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.

Maple

seq(seq(binomial(n, k)*6^(n-k)*6^k, k=0..n), n=0..8); (C. Ronaldo)

Crossrefs

Sequence in context: A176861 A377204 A245131 * A242087 A217978 A257626

Adjacent sequences: A038257 A038258 A038259 * A038261 A038262 A038263

Keyword

nonn,tabl,easy

Author

N. J. A. Sloane.

Status

approved