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Search: id:A136530
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| 1, 6, 23, 74, 216, 592, 1552, 3936, 9728, 23552, 56064, 131584, 305152, 700416
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OFFSET
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0,2
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COMMENT
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Double binomial transform of [1, 4, 3, 0, 0, 0,...].
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FORMULA
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Binomial transform of the Pentagonal numbers, (A000326 starting 1, 5, 12, 22,...).
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EXAMPLE
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a(3) = 23 = (1, 2, 1) dot (1, 5, 12), = (1 + 10 + 12).
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CROSSREFS
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Cf. A000326.
Sequence in context: A045618 A038737 A038797 this_sequence A054459 A060188 A058751
Adjacent sequences: A136527 A136528 A136529 this_sequence A136531 A136532 A136533
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KEYWORD
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nonn
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AUTHOR
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Gary W. Adamson (qntmpkt(AT)yahoo.com), Jan 03 2008
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