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Search: id:A003470
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| A003470 |
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a(n) = n*a(n-1) - a(n-2) + 1 + (-1)^n.
(Formerly M2759)
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+0
3
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| 1, 1, 3, 8, 31, 147, 853, 5824, 45741, 405845, 4012711, 43733976, 520795003, 6726601063, 93651619881, 1398047697152, 22275111534553, 377278848390249, 6768744159489931, 128228860181918440, 2557808459478878871
(list; graph; listen)
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OFFSET
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0,3
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COMMENT
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Row sums of A086764. - DELEHAM Philippe (kolotoko(AT)wanadoo.fr), Apr 27 2004
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FORMULA
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Diagonal sums of reverse of permutation triangle A008279. a(n)=sum{k=0..floor(n/2), (n-k)!/k!}. - Paul Barry (pbarry(AT)wit.ie), May 12 2004
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CROSSREFS
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Cf. A072374.
Adjacent sequences: A003467 A003468 A003469 this_sequence A003471 A003472 A003473
Sequence in context: A066165 A119838 A108492 this_sequence A022563 A103939 A094610
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KEYWORD
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nonn,easy
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AUTHOR
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njas, jr
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EXTENSIONS
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More terms from Gabriel Cunningham (gcasey(AT)mit.edu), Oct 25 2004
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