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Search: id:A121394
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| A121394 |
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Column 3 of triangle A121391, where column k of T=A121391 equals column k of T^(k+1) shift down 1 row. |
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+0
4
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| 1, 1, 4, 22, 146, 1131, 10120, 104015, 1220957, 16253289, 243450538, 4070466861, 75393600728, 1536160429870, 34213493149270, 828220957918213, 21680478452572459, 610911511290740374, 18453811792850260925
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OFFSET
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0,3
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COMMENT
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Also equal to column 3 (shifted 1 place) of the matrix 4th power of triangle A121391.
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PROGRAM
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(PARI) {a(n)=local(A=Mat(1), B); for(m=1, n+4, B=matrix(m, m); for(i=1, m, for(j=1, i, if(j==i, B[i, j]=1, B[i, j]=(A^j)[i-1, j]); )); A=B); return(A[n+4, 4])}
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CROSSREFS
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Cf. A121391 (triangle), A121392 (column 1), A121393 (column 2).
Sequence in context: A134988 A081002 A057834 this_sequence A005039 A112898 A111529
Adjacent sequences: A121391 A121392 A121393 this_sequence A121395 A121396 A121397
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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), Jul 27 2006
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