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A121415
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Column 3 of triangle A121412, in which row n of T=A121412 equals row (n-1) of T^(n+1) with an appended '1'.
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3
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1, 1, 6, 63, 924, 17226, 387567, 10182744, 305379129, 10280074116, 383492465902, 15692864353299, 698622377024472, 33604795914668178, 1736477536255603281, 95918139377302294980, 5639487915973132301793, 351611645300506492405623
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OFFSET
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0,3
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COMMENTS
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Also equals column 5 of triangle A101479.
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LINKS
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Table of n, a(n) for n=0..17.
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PROG
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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^i)[i-1, j]); )); A=B); return((A^1)[n+4, 4])}
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CROSSREFS
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Cf. A121412 (triangle); other columns: A101483, A121413, A121414; A101479 (triangle).
Sequence in context: A132078 A113669 A340912 * A227278 A295267 A098342
Adjacent sequences: A121412 A121413 A121414 * A121416 A121417 A121418
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KEYWORD
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nonn
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AUTHOR
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Paul D. Hanna, Aug 22 2006
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STATUS
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approved
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