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Search: id:A121393
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| A121393 |
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Column 2 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, 3, 12, 58, 333, 2268, 18281, 173127, 1905500, 24080964, 345381551, 5563259860, 99716732043, 1973012968122, 42792555114812, 1011125250589597, 25886430637780776, 714600877541340733, 21178498962170286988
(list; graph; listen)
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OFFSET
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0,3
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COMMENT
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Also equal to column 2 (shifted 1 place) of the matrix cube of triangle A121391.
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PROGRAM
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(PARI) {a(n)=local(A=Mat(1), B); for(m=1, n+3, 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+3, 3])}
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CROSSREFS
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Cf. A121391 (triangle), A121392 (column 1), A121394 (column 3).
Sequence in context: A059440 A020075 A020030 this_sequence A003316 A126959 A058861
Adjacent sequences: A121390 A121391 A121392 this_sequence A121394 A121395 A121396
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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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