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A113395
Column 0 of triangle A113394, which equals the matrix cube of A113389.
9
1, 9, 99, 1569, 34344, 980487, 34930455, 1502349459, 76058669082, 4443563603890, 294878418586620, 21942670402467153, 1811533845177895161, 164451065361854357011, 16291788187615516225925
OFFSET
0,2
FORMULA
Column k of A113389^3 = column 0 of A113389^(3*k+3) for k>=0.
PROG
(PARI) a(n)=local(A, B); A=Mat(1); for(m=2, n+1, B=matrix(m, m); for(i=1, m, for(j=1, i, if(i<3 || j==i || j>m-1, B[i, j]=1, if(j==1, B[i, 1]=1, B[i, j]=(A^(3*j-2))[i-j+1, 1])); )); A=B); (matrix(#A, #A, r, c, if(r>=c, (A^(3*c))[r-c+1, 1]))^3)[n+1, 1]
CROSSREFS
Sequence in context: A356100 A080291 A215243 * A070068 A068668 A035027
KEYWORD
nonn
AUTHOR
Paul D. Hanna, Nov 14 2005
STATUS
approved