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Search: id:A026005
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| 1, 4, 27, 208, 1700, 14364, 123970, 1085760, 9612108, 85795600, 770755843, 6960408624, 63127818572, 574609830760, 5246348656500, 48027225765120, 440671237120764, 4051508174260272, 37315784743418332
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OFFSET
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0,2
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FORMULA
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(2n+2)/(3n+2) * C(4n+1, n). - R. Stephan, Apr 30 2004
a(n)=C(4n,n)-C(4n,n-2)=A039598(2n,n). [From Paul Barry (pbarry(AT)wit.ie), Apr 21 2009]
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PROGRAM
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(PARI) (2*n+2)/(3*n+2)*binomial(4*n+1, n)
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CROSSREFS
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Sequence in context: A164311 A091125 A091121 this_sequence A059391 A161120 A121063
Adjacent sequences: A026002 A026003 A026004 this_sequence A026006 A026007 A026008
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KEYWORD
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nonn
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AUTHOR
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Clark Kimberling (ck6(AT)evansville.edu)
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EXTENSIONS
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More terms from R. Stephan, Apr 30 2004
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