A073156 - OEIS

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A073156

Main diagonal sequence of triangle A073153.

1, 2, 9, 36, 156, 698, 3210, 15080, 72060, 349184, 1711869, 8475494, 42318018, 212843826, 1077391794, 5484472880, 28058940086, 144195777552, 744017466318, 3852968380624, 20019113126120, 104329129258596, 545214946753377 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,2`
	FORMULA	`Convolution of sequence A073155: a(n)=sum{k=0..n} A073155(k)* A073155(n-k).` `G.f.: 1/4(1-(1-4x*(1+x)^2)^(1/2))^2/x^2/(1+x)^4. - Vladeta Jovovic (vladeta(AT)eunet.rs), Oct 10 2003`
	CROSSREFS	`Cf. A073153, A073155, A073157.` `Sequence in context: A121769 A006782 A150968 * A150969 A150970 A150971` `Adjacent sequences: A073153 A073154 A073155 * A073157 A073158 A073159`
	KEYWORD	`easy,nonn`
	AUTHOR	`Paul D. Hanna (pauldhanna(AT)juno.com), Jul 29 2002`
	EXTENSIONS	`More terms from Vladeta Jovovic (vladeta(AT)eunet.rs), Oct 10 2003`

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Last modified February 15 23:34 EST 2012. Contains 205860 sequences.