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A194951
Central terms of triangle A194949 = sums of squares of terms in rows of triangle A194949.
3
1, 2, 12, 104, 1144, 13736, 180936, 2524968, 36428808, 549363240, 8453581224, 134086928456, 2142841448200, 35328245141864, 581259305091816, 9814113557287304, 165892448199221064, 2855555645146526760, 49032490558950500392, 859559382871581588424
OFFSET
0,2
PROG
(PARI) {a(n)=local(M=matrix(n+1, n+1, r, c, if(r>=c, 1))); for(i=1, n, M=matrix(n+1, n+1, r, c, if(r>=c, if(c==1, if(r==1, 1, sum(j=1, r-1, (M*M~)[r-j, j])), (M*M~)[r-c+1, c])))); sum(k=0, n, M[n+1, k+1]^2)}
CROSSREFS
Sequence in context: A061632 A301833 A320899 * A104533 A216794 A218300
KEYWORD
nonn
AUTHOR
Paul D. Hanna, Sep 05 2011
STATUS
approved