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A113994
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Column 2 of triangle A113993, also equals column 0 of A113983^3.
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6
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1, 3, 9, 27, 89, 327, 1353, 6303, 32953, 192395, 1247473, 8931643, 70221841, 603040399, 5628477521, 56832554399, 618172840753, 7214736795987, 90023735419577, 1196943617218715, 16905957430843689, 252946811300548119
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OFFSET
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0,2
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LINKS
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EXAMPLE
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1;
3,1;
9,6,1;
27,27,9,1;
89,117,57,12,1;
327,529,333,99,15,1;
1353,2583,1965,735,153,18,1;
6303,13815,12185,5393,1383,219,21,1;
32953,81321,80865,40785,12169,2337,297,24,1; ...
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PROG
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(PARI) a(n)=local(A, B); A=Mat(1); for(m=2, n+2, B=matrix(m, m); for(i=1, m, for(j=1, i, if(i<3 || j==1 || j==i, B[i, j]=1, B[i, j]=A[i-1, j-1]+(A^2)[i-2, j-1] ); )); A=B); (A^3)[n+1, 1]
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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