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Search: id:A128576
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| 1, 7, 112, 2464, 65520, 1991808, 67189248, 2469837888, 97765355520, 4132860197760, 185458263419520, 8794132843507200, 439083652465543680, 23017956568726049280, 1263929372436815078400, 72550400791147384412160
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OFFSET
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0,2
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FORMULA
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G.f.: A(x) = 1 + 7x*R(x,7)^2, where R(x,7) = 1 + 8*x*R(x,8)^2, R(x,8) = 1 + 9*x*R(x,9)^2, ..., R(x,n) = 1 + (n+1)*x*R(x,n+1)^2, ... and R(x,n) is the g.f. of row n of table A128570.
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PROGRAM
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(PARI) {a(n)=local(A=1+(n+7)*x); for(j=0, n, A=1+(n+7-j)*x*A^2 +x*O(x^n)); polcoeff(A, n)}
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CROSSREFS
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Cf. A128570 (triangle), other rows: A128318, A128571, A128572, A128573, A128574, A128575; A128577 (square of row 0), A128578 (main diagonal), A128579 (antidiagonal sums).
Sequence in context: A094219 A067404 A129030 this_sequence A147631 A010795 A099153
Adjacent sequences: A128573 A128574 A128575 this_sequence A128577 A128578 A128579
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KEYWORD
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nonn
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AUTHOR
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Paul D. Hanna (pauldhanna(AT)juno.com), Mar 11 2007
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