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A038215 Triangle whose (i,j)-th entry is binomial(i,j)*2^(i-j)*9^j. 0
1, 2, 9, 4, 36, 81, 8, 108, 486, 729, 16, 288, 1944, 5832, 6561, 32, 720, 6480, 29160, 65610, 59049, 64, 1728, 19440, 116640, 393660, 708588, 531441, 128, 4032, 54432, 408240, 1837080, 4960116, 7440174, 4782969, 256, 9216, 145152 (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: A171560 A054789 A002508 * A119019 A127145 A003725

Adjacent sequences:  A038212 A038213 A038214 * A038216 A038217 A038218

KEYWORD

nonn,tabl,easy

AUTHOR

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

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Last modified February 17 18:41 EST 2012. Contains 206074 sequences.