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A084901
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4^(n-2)n(5n+3)/2.
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2
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0, 1, 13, 108, 736, 4480, 25344, 136192, 704512, 3538944, 17367040, 83623936, 396361728, 1853882368, 8573157376, 39258685440, 178241142784, 803158884352, 3594887626752, 15994458210304, 70781061038080, 311711546474496
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OFFSET
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0,3
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COMMENTS
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Binomial transform of A084900. Third binomial transform of heptagonal numbers A000566. Fourth binomial transform of (0,1,5,0,0,0,....).
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LINKS
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Table of n, a(n) for n=0..21.
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FORMULA
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G.f.: x(1 + x)/(1 - 4x)^3
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CROSSREFS
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Cf. A084902.
Sequence in context: A168117 A038384 A038385 * A006239 A142040 A002648
Adjacent sequences: A084898 A084899 A084900 * A084902 A084903 A084904
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KEYWORD
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easy,nonn
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AUTHOR
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Paul Barry, Jun 10 2003
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STATUS
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approved
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