A124429 - OEIS

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A124429

Antidiagonal sums of triangle A124428.

1, 1, 1, 2, 3, 5, 8, 13, 22, 36, 61, 102, 172, 292, 493, 841, 1429, 2439, 4169, 7124, 12216, 20930, 35940, 61749, 106155, 182749, 314638, 542338, 935195, 1613593, 2786037, 4811920, 8316435, 14378247, 24870062, 43036264, 74496224, 129008514 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,4`
	FORMULA	`a(n) = Sum_{k=0..[n/3]} C([(n-k)/2],k)*C([(n-k+1)/2],k)).`
	PROG	`(PARI) a(n)=sum(k=0, n\3, binomial((n-k)\2, k)*binomial((n-k+1)\2, k))`
	CROSSREFS	`Cf. A124428, A124430.` `Sequence in context: A206743 A186085 A018151 * A018152 A005683 A173404` `Adjacent sequences: A124426 A124427 A124428 * A124430 A124431 A124432`
	KEYWORD	`nonn`
	AUTHOR	`Paul D. Hanna (pauldhanna(AT)juno.com), Oct 31 2006`

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Last modified February 17 00:09 EST 2012. Contains 205978 sequences.