A038293 - OEIS

A038293

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

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

(list; table; graph; refs; listen; history; text; internal format)

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..35.

CROSSREFS

Sequence in context: A248311 A367826 A302536 * A119516 A193109 A242069

Adjacent sequences: A038290 A038291 A038292 * A038294 A038295 A038296

KEYWORD

nonn,tabl,easy

AUTHOR

N. J. A. Sloane.

STATUS

approved