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A024482
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(1/2)*(C(2n,n) - C(2n-2,n-1)).
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2
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2, 7, 25, 91, 336, 1254, 4719, 17875, 68068, 260338, 999362, 3848222, 14858000, 57500460, 222981435, 866262915, 3370764540, 13135064250, 51250632510, 200205672810, 782920544640, 3064665881940, 12007086477750, 47081501377326
(list; graph; refs; listen; history; internal format)
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OFFSET
| 2,1
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FORMULA
| a(n) =A051924/2 - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Jan 16 2007
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MAPLE
| Z:=(1-z-sqrt(1-4*z))/sqrt(1-4*z)/2: Zser:=series(Z, z=0, 32): seq(coeff(Zser, z, n), n=2..25); - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Jan 16 2007
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MATHEMATICA
| Table[(Binomial[2n, n]-Binomial[2n-2, n-1])/2, {n, 2, 30}] (* From Harvey P. Dale, Mar 4 2011 *)
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CROSSREFS
| Sequence in context: A052936 A108152 A097613 * A074605 A108081 A199247
Adjacent sequences: A024479 A024480 A024481 * A024483 A024484 A024485
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KEYWORD
| nonn
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AUTHOR
| Clark Kimberling (ck6(AT)evansville.edu)
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