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 A121416 Matrix square of triangle A121412. 12
 1, 2, 1, 7, 2, 1, 43, 9, 2, 1, 403, 69, 11, 2, 1, 5188, 769, 101, 13, 2, 1, 85569, 11346, 1305, 139, 15, 2, 1, 1725291, 208914, 21745, 2043, 183, 17, 2, 1, 41145705, 4613976, 443329, 37971, 3015, 233, 19, 2, 1, 1133047596, 118840164, 10679494, 850260 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 COMMENTS Row n of triangle T=A121412 equals row (n-1) of T^(n+1) with an appended '1'. LINKS EXAMPLE Triangle begins: 1; 2, 1; 7, 2, 1; 43, 9, 2, 1; 403, 69, 11, 2, 1; 5188, 769, 101, 13, 2, 1; 85569, 11346, 1305, 139, 15, 2, 1; 1725291, 208914, 21745, 2043, 183, 17, 2, 1; 41145705, 4613976, 443329, 37971, 3015, 233, 19, 2, 1; 1133047596, 118840164, 10679494, 850260, 61860, 4253, 289, 21, 2, 1; PROG (PARI) {T(n, k)=local(A=Mat(1), B); for(m=1, n+1, 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^2)[n+1, k+1])} CROSSREFS Cf. A121412, A121420; A101479; columns: A121417, A121418, A121419. Sequence in context: A205945 A124392 A144446 * A317547 A089329 A213053 Adjacent sequences: A121413 A121414 A121415 * A121417 A121418 A121419 KEYWORD nonn,tabl AUTHOR Paul D. Hanna, Aug 22 2006 STATUS approved

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Last modified March 26 14:32 EDT 2023. Contains 361549 sequences. (Running on oeis4.)