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Search: id:A117399
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| 1, 1, 2, 7, 34, 202, 1402, 11122, 99322, 986362, 10784122, 128720122, 1665516922, 23220588922, 347025670522, 5534133996922, 93802153836922, 1683934185324922, 31917365573484922, 636941680764780922, 13348854673487724922
(list; graph; listen)
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OFFSET
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1,3
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PROGRAM
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(PARI) {a(n)=local(M=matrix(n+4, n+4, r, c, if(r>=c, if(r==c+1, -c, 1))), L=sum(m=1, n+4, (M^0-M)^m/m)); L[n+2, 2]/2}
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CROSSREFS
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Cf. A117398, A117396.
Sequence in context: A023053 A058915 A020054 this_sequence A145345 A056543 A075834
Adjacent sequences: A117396 A117397 A117398 this_sequence A117400 A117401 A117402
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KEYWORD
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nonn
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AUTHOR
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Paul D. Hanna (pauldhanna(AT)juno.com), Mar 11 2006
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