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A038222 Triangle whose (i,j)-th entry is binomial(i,j)*3^(i-j)*4^j. 1
1, 3, 4, 9, 24, 16, 27, 108, 144, 64, 81, 432, 864, 768, 256, 243, 1620, 4320, 5760, 3840, 1024, 729, 5832, 19440, 34560, 34560, 18432, 4096, 2187, 20412, 81648, 181440, 241920, 193536, 86016, 16384, 6561, 69984, 326592, 870912, 1451520 (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: A032789 A089243 A034921 * A038629 A105229 A080849

Adjacent sequences:  A038219 A038220 A038221 * A038223 A038224 A038225

KEYWORD

nonn,tabl,easy

AUTHOR

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

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Last modified February 14 08:58 EST 2012. Contains 205614 sequences.