id:A103978 - OEIS Search Results

Search: id:A103978

Displaying 1-1 of 1 results found.

page 1

Expansion of (sqrt(1-12x^2)+12x^2+2x-1)/(2x(1-12x^2)).

+0
1

1, 3, 6, 9, 54, 54, 540, 405, 5670, 3402, 61236, 30618, 673596, 288684, 7505784, 2814669, 84440070, 28146690, 956987460, 287096238, 10909657044, 2975361012, 124965162504, 31241290626, 1437099368796, 331638315876, 16581915793800 (list; graph; listen)

	OFFSET	`0,2`
	FORMULA	`G.f.: 1/sqrt(1-12x^2)+(1-sqrt(1-12x^2))/(2x); a(n)=sum{k=0..floor(n/2), 3^(n-k)*C(k)C(k+1, n-k)}.`
	CROSSREFS	`Cf. A025225, A059304, A103973.` `Sequence in context: A045638 A038224 A133195 this_sequence A073910 A115251 A057241` `Adjacent sequences: A103975 A103976 A103977 this_sequence A103979 A103980 A103981`
	KEYWORD	`easy,nonn`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Feb 23 2005`

page 1

Search completed in 0.002 seconds

Last modified November 24 14:25 EST 2009. Contains 167438 sequences.

AT&T Labs Research