A038227 Triangle whose (i,j)-th entry is binomial(i,j)*3^(i-j)*9^j.

1, 3, 9, 9, 54, 81, 27, 243, 729, 729, 81, 972, 4374, 8748, 6561, 243, 3645, 21870, 65610, 98415, 59049, 729, 13122, 98415, 393660, 885735, 1062882, 531441, 2187, 45927, 413343, 2066715, 6200145, 11160261, 11160261, 4782969, 6561

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: A223653 A351929 A238912 * A080292 A273893 A228165

Adjacent sequences: A038224 A038225 A038226 * A038228 A038229 A038230

Keyword

nonn,tabl,easy

Author

N. J. A. Sloane.

Status

approved