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A038230 Triangle whose (i,j)-th entry is binomial(i,j)*3^(i-j)*12^j. 0
1, 3, 12, 9, 72, 144, 27, 324, 1296, 1728, 81, 1296, 7776, 20736, 20736, 243, 4860, 38880, 155520, 311040, 248832, 729, 17496, 174960, 933120, 2799360, 4478976, 2985984, 2187, 61236, 734832, 4898880, 19595520, 47029248, 62705664 (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..34.

CROSSREFS

Sequence in context: A298028 A215842 A018876 * A292581 A207852 A182455

Adjacent sequences:  A038227 A038228 A038229 * A038231 A038232 A038233

KEYWORD

nonn,tabl,easy

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified September 28 13:24 EDT 2020. Contains 337393 sequences. (Running on oeis4.)