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Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!) 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 (list; graph; refs; listen; history; text; internal format) 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

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Last modified August 18 13:06 EDT 2024. Contains 375269 sequences. (Running on oeis4.)