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Search: id:A114157
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| 1, -1, 3, 6, -8, -501, -13623, -409953, -14544683, -607055209, -29421219966, -1632715832341, -102423931253271, -7182065357683744, -557479490745141406, -47499193522110824640, -4410100445892863617679, -443346294340660384160358
(list; graph; listen)
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OFFSET
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0,3
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PROGRAM
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(PARI) {a(n)=local(P, Q, R, W); P=Mat(1); for(m=2, n+1, W=matrix(m, m); for(i=1, m, for(j=1, i, if(i<3|j==i|j>m-1, W[i, j]=1, if(j==1, W[i, 1]=1, W[i, j]=(P^(3*j-2))[i-j+1, 1])); )); P=W); (P^-1)[n+1, 1]}
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CROSSREFS
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Cf. A114156, A113370.
Sequence in context: A098106 A059361 A103268 this_sequence A021275 A094560 A131579
Adjacent sequences: A114154 A114155 A114156 this_sequence A114158 A114159 A114160
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KEYWORD
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sign
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AUTHOR
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Paul D. Hanna (pauldhanna(AT)juno.com), Nov 15 2005
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