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A126068
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See formula line for g.f.
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2
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0, 0, 2, 2, 4, 8, 18, 42, 102, 254, 646, 1670, 4376, 11596, 31022, 83670, 227268, 621144, 1706934, 4713558, 13072764, 36398568, 101704038, 285095118, 801526446, 2259520830, 6385455594, 18086805002, 51339636952, 146015545604
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,3
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COMMENTS
| Except for initial terms, identical to A007971.
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FORMULA
| zl:=4*(1-z+sqrt(1-2*z-3*z^2))/(1-z+sqrt(1-2*z-3*z^2))^2: gser:=series(zl, z=0, 35): seq(coeff(gser, z, n), n=-2..27);
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MAPLE
| zl:=4*(1-z+sqrt(1-2*z-3*z^2))/(1-z+sqrt(1-2*z-3*z^2))^2: gser:=series(zl, z=0, 35): seq(coeff(gser, z, n), n=-2..27);
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CROSSREFS
| Sequence in context: A007971 * A167022 A168055 A005702 A095335 A100396
Adjacent sequences: A126065 A126066 A126067 * A126069 A126070 A126071
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KEYWORD
| nonn
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AUTHOR
| Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Feb 28 2007
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