A098543 - OEIS

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A098543

Column 2 of triangle A098542, which shifts left and up under the matrix square.

1, 4, 12, 44, 236, 2028, 29164, 719340, 30943724, 2350770668, 318680099308, 77793540073964, 34472347123476972, 27928291976711924204, 41631598900551078537708, 114829789064202679162399212 (list; graph; refs; listen; history; internal format)

	OFFSET	`2,2`
	COMMENTS	`Related to A002449, the number of different types of binary trees of height n.`
	FORMULA	`G.f.: A(x) = x(1+x)/(1-x)(G002449(x)-1), where G002449(x) is g.f. of A002449.`
	CROSSREFS	`Cf. A002449, A098542, A098544.` `Sequence in context: A007860 A039740 A065143 * A028407 A105344 A074035` `Adjacent sequences: A098540 A098541 A098542 * A098544 A098545 A098546`
	KEYWORD	`nonn`
	AUTHOR	`Paul D. Hanna (pauldhanna(AT)juno.com), Sep 16 2004`

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Last modified February 16 09:00 EST 2012. Contains 205904 sequences.