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Search: id:A092822
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| 1, 3, 10, 32, 100, 312, 988, 3208, 10728, 36944, 130604, 471880, 1734616, 6461808, 24317080, 92222288, 351854032, 1348762016, 5189792716, 20031335240, 77516440696, 300630949424, 1168151092552, 4546596321392, 17721978842800
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OFFSET
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0,2
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FORMULA
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Superseeker suggested (1-x+ 2 I x^2/Sqrt[ -1+ 4 x])/(1-2 x)^2, first 32 terms agreeing.
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MATHEMATICA
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Table[Sum[(# Conjugate[ # ]&)@ Sum[Binomial[n, t] I^t, {t, 0, k}], {k, 0, n}], {n, 0, 32}] or also CoefficientList[Series[(1-x+2I x^2/Sqrt[ -1+4x])/(1-2x)^2, {x, 0, 32}], x]
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CROSSREFS
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Cf. A092821.
Sequence in context: A104270 A038731 A053581 this_sequence A017935 A134377 A077826
Adjacent sequences: A092819 A092820 A092821 this_sequence A092823 A092824 A092825
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KEYWORD
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easy,nonn
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AUTHOR
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Wouter Meeussen (wouter.meeussen(AT)pandora.be), Mar 06 2004
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