id:A027412 - OEIS Search Results

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a(n) = 2*a(n-1) + (n-2)*a(n-2).

+0
2

1, 2, 4, 10, 28, 86, 284, 998, 3700, 14386, 58372, 246218, 1076156, 4860710, 22635292, 108459814, 533813716, 2694524642, 13930068740, 73667056394, 398075350108, 2195824771702, 12353156545564, 70818633296870 (list; graph; listen)

	OFFSET	`0,2`
	REFERENCES	`R. Donaghey, Binomial self-inverse sequences and tangent coefficients, J. Combin. Theory, Series A, 21 (1976), 155-163.`
	CROSSREFS	`a(n) = 2 * A005425(n-1), n>0.` `Sequence in context: A149828 A149829 A149830 this_sequence A030277 A149831 A149832` `Adjacent sequences: A027409 A027410 A027411 this_sequence A027413 A027414 A027415`
	KEYWORD	`nonn,easy`
	AUTHOR	`Olivier Gerard (olivier.gerard(AT)gmail.com)`

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Last modified November 27 22:38 EST 2009. Contains 167602 sequences.

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