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A038224 Triangle whose (i,j)-th entry is binomial(i,j)*3^(i-j)*6^j. 0
1, 3, 6, 9, 36, 36, 27, 162, 324, 216, 81, 648, 1944, 2592, 1296, 243, 2430, 9720, 19440, 19440, 7776, 729, 8748, 43740, 116640, 174960, 139968, 46656, 2187, 30618, 183708, 612360, 1224720, 1469664, 979776, 279936, 6561, 104976 (list; table; graph; refs; listen; history; 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.

CROSSREFS

Sequence in context: A193802 A195205 A045638 * A133195 A196156 A103978

Adjacent sequences:  A038221 A038222 A038223 * A038225 A038226 A038227

KEYWORD

nonn,tabl,easy

AUTHOR

N. J. A. Sloane (njas(AT)research.att.com).

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Last modified February 15 23:34 EST 2012. Contains 205860 sequences.