A194951 Central terms of triangle A194949 = sums of squares of terms in rows of triangle A194949.

1, 2, 12, 104, 1144, 13736, 180936, 2524968, 36428808, 549363240, 8453581224, 134086928456, 2142841448200, 35328245141864, 581259305091816, 9814113557287304, 165892448199221064, 2855555645146526760, 49032490558950500392, 859559382871581588424

Offset

0,2

Links

Table of n, a(n) for n=0..19.

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

Cf. A194949, A194951.

Sequence in context: A061632 A301833 A320899 * A104533 A216794 A218300

Adjacent sequences: A194948 A194949 A194950 * A194952 A194953 A194954

Keyword

nonn

Author

Paul D. Hanna, Sep 05 2011

Status

approved