id:A136503 - OEIS Search Results

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Column 2 of triangle A136502.

+0
2

1, -4, 26, -308, 6959, -306888, 26732904, -4628215312, 1597488685120, -1101039613155676, 1516536435306750724, -4175994577753360618608, 22993788379965461938093352, -253190775338116964702467771168 (list; graph; listen)

	OFFSET	`0,2`
	FORMULA	`G.f.: 1 = Sum_{n>=0} a(n)x^n(1+x)^(2^(n+2)).`
	PROGRAM	`(PARI) {a(n)=local(M=matrix(n+3, n+3, r, c, binomial(2^(c-1), r-c))); (M^-1)[n+3, 3]}`
	CROSSREFS	`Cf. A107354 (column 0 of A136502).` `Sequence in context: A156306 A054592 A102202 this_sequence A114125 A063182 A167147` `Adjacent sequences: A136500 A136501 A136502 this_sequence A136504 A136505 A136506`
	KEYWORD	`sign`
	AUTHOR	`Paul D. Hanna (pauldhanna(AT)juno.com), Jan 01 2008`

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Last modified December 16 17:18 EST 2009. Contains 170825 sequences.

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