A038268 Triangle whose (i,j)-th entry is binomial(i,j)*7^(i-j)*2^j.

1, 7, 2, 49, 28, 4, 343, 294, 84, 8, 2401, 2744, 1176, 224, 16, 16807, 24010, 13720, 3920, 560, 32, 117649, 201684, 144060, 54880, 11760, 1344, 64, 823543, 1647086, 1411788, 672280, 192080, 32928, 3136, 128, 5764801, 13176688, 13176688

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..38.

Crossrefs

Sequence in context: A246799 A248189 A096040 * A100983 A350621 A395608

Adjacent sequences: A038265 A038266 A038267 * A038269 A038270 A038271

Keyword

nonn,tabl,easy

Author

N. J. A. Sloane

Status

approved