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A128578
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Main diagonal of table A128570.
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9
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1, 2, 24, 580, 21420, 1068480, 67189248, 5098406400, 453030209280, 46120247659200, 5290918350734016, 675157532791996800, 94836990558591590400, 14538639675855504384000, 2415072877848471727687680
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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PROG
| (PARI) {a(n)=local(A=1+(2*n+1)*x); for(j=0, n, A=1+(2*n+1-j)*x*A^2 +x*O(x^n)); polcoeff(A, n)}
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CROSSREFS
| Cf. A128570 (triangle), rows: A128318, A128571, A128572, A128573, A128574, A128575, A128576; A128577 (square of row 0), A128579 (antidiagonal sums).
Sequence in context: A090732 A014298 A090316 * A186632 A089835 A009251
Adjacent sequences: A128575 A128576 A128577 * A128579 A128580 A128581
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KEYWORD
| nonn
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AUTHOR
| Paul D. Hanna (pauldhanna(AT)juno.com), Mar 11 2007
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