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Search: id:A082578
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| 1, 7, 67, 767, 9587, 126011, 1711595, 23796515, 336666215, 4828084575, 69994481871, 1023793569567, 15086216016367, 223704570996367, 3335098322412367, 49954148031128767, 751296616443141667
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OFFSET
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0,2
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FORMULA
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Formula: a(n) = Sum[ Binomial[ 2 k, k ] Binomial[ 2 k + 1, k ], { k, 0, n } ] Recurrence: ( n + 3 ) ( n + 2 ) a(n+2) - ( 17 n^2 + 69 n + 66 ) a(n+1) + ( 16 n^2 + 64 n + 60 ) a(n) = 0
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CROSSREFS
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Partial sums of A000894.
Sequence in context: A036948 A020469 A038386 this_sequence A082698 A093170 A120079
Adjacent sequences: A082575 A082576 A082577 this_sequence A082579 A082580 A082581
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KEYWORD
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easy,nonn
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AUTHOR
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Emanuele Munarini (munarini(AT)mate.polimi.it), May 07 2003
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