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A038230
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Triangle whose (i,j)-th entry is binomial(i,j)*3^(i-j)*12^j.
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0
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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
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OFFSET
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0,2
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REFERENCES
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B. N. Cyvin et al., Isomer enumeration of unbranched catacondensed polygonal systems with pentagons and heptagons, Match, No. 34 (Oct 1996), pp. 109-121.
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CROSSREFS
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KEYWORD
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AUTHOR
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STATUS
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approved
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