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A082145
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A subdiagonal of number array A082137.
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4
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1, 5, 42, 336, 2640, 20592, 160160, 1244672, 9674496, 75246080, 585761792, 4564377600, 35602145280, 277970595840, 2172375244800, 16992801914880, 133035751833600, 1042374243778560, 8173537721057280, 64136851016908800
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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FORMULA
| a(n)=(2^(n-1)+0^n/2)C(2n+3, n)
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EXAMPLE
| a(0)=(2^(-1)+(0^0)/2)C(3,0)=2*(1/2)=1 (use 0^0=1).
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MAPLE
| Z:=(1-3*z-sqrt(1-4*z))/sqrt(1-4*z)/64: Zser:=series(Z, z=0, 32): seq(coeff(Zser*2^(n+1), z, n), n=4..23); - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Jan 01 2007
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CROSSREFS
| Cf. A069723, A082143, A082144.
Sequence in context: A145008 A025173 A062021 * A126765 A024492 A005789
Adjacent sequences: A082142 A082143 A082144 * A082146 A082147 A082148
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KEYWORD
| easy,nonn
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AUTHOR
| Paul Barry (pbarry(AT)wit.ie), Apr 06 2003
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