id:A014433 - OEIS Search Results

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a[n] = Sum[ a[i]a[n-i],{i,0,n-1} ], a[ 0 ] = 1, a[ 1 ]=4.

+0
2

1, 4, 4, 20, 52, 228, 804, 3444, 13780, 59588, 253252, 1113556, 4892276, 21860260, 98055780, 444148020, 2021194260, 9257373060, 42583930500, 196811777940, 913015265460, 4251135572580, 19856669967780 (list; graph; listen)

	OFFSET	`0,2`
	FORMULA	`G.f.:(1+x-sqrt(1-2x-15x^2))/(2*x) - C. Ronaldo (aga_new_ac(AT)hotmail.com), Dec 19 2004`
	CROSSREFS	`Sequence in context: A117857 A165559 A052923 this_sequence A072696 A075219 A088304` `Adjacent sequences: A014430 A014431 A014432 this_sequence A014434 A014435 A014436`
	KEYWORD	`nonn`
	AUTHOR	`Wouter Meeussen (wouter.meeussen(AT)pandora.be)`

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Last modified December 15 00:47 EST 2009. Contains 170825 sequences.

AT&T Labs Research