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A122887
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An upper diagonal of table A122888.
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2
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1, 10, 118, 1656, 27326, 520626, 11271436, 273613032, 7365210840, 217823497200, 7022714928604, 245186433880584, 9217032342988575, 371216529334562246, 15948164256621353088, 728062466187371268960, 35197679178007576031784
(list; graph; refs; listen; history; internal format)
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OFFSET
| 4,2
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PROG
| (PARI) {a(n)=local(F=x+x^2, G=x+x*O(x^(n+1))); if(n<3, 0, for(i=1, n-2, G=subst(F, x, G)); return(polcoeff(G, n+0, x)))}
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CROSSREFS
| Cf. A122888; A122892.
Sequence in context: A083448 A024129 A155622 * A145510 A160601 A024128
Adjacent sequences: A122884 A122885 A122886 * A122888 A122889 A122890
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KEYWORD
| nonn
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AUTHOR
| Paul D. Hanna (pauldhanna(AT)juno.com), Sep 18 2006
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