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Search: id:A081341
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| A081341 |
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Expansion of exp(3x)cosh(3x). |
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+0
4
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| 1, 3, 18, 108, 648, 3888, 23328, 139968, 839808, 5038848, 30233088, 181398528, 1088391168, 6530347008, 39182082048, 235092492288, 1410554953728, 8463329722368, 50779978334208, 304679870005248, 1828079220031488
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OFFSET
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0,2
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COMMENT
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Binomial transform of A081341. 3rd binomial transform of (1,0,9,0,81,0,729,0,..).
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FORMULA
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a(0)=1, a(n)=6^n/2, n>0 G.f.: (1-3x)/(1-6x). E.g.f. exp(3x)cosh(3x).
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CROSSREFS
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Cf. A034494, A081342.
Adjacent sequences: A081338 A081339 A081340 this_sequence A081342 A081343 A081344
Sequence in context: A007277 A025595 A137962 this_sequence A132900 A050623 A037760
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KEYWORD
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easy,nonn
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AUTHOR
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Paul Barry (pbarry(AT)wit.ie), Mar 18 2003
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