id:A166036 - OEIS Search Results

Search: id:A166036

Displaying 1-1 of 1 results found.

page 1

a(n)= (4^n+8*(-5)^n)/9.

+0
6

1, -4, 24, -104, 584, -2664, 14344, -67624, 354504, -1706984, 8797064, -42936744, 218878024, -1077612904, 5455173384, -27007431464, 136110899144, -676259528424, 3398477511304, -16923668079784 (list; graph; listen)

	OFFSET	`0,2`
	FORMULA	`a(0)= 1, a(1)= -4, a(n)= 20a(n-2)-a(n-1) for n>1. a(n)= Sum_{k, 0<=k<=n} A112555(n,k)(-5)^k. G.f.: (1-3x)/(1+x-20x^2).`
	CROSSREFS	`Cf. A077925, A091004, A166035` `Sequence in context: A043009 A006736 A165752 this_sequence A120908 A145655 A059153` `Adjacent sequences: A166033 A166034 A166035 this_sequence A166037 A166038 A166039`
	KEYWORD	`easy,sign`
	AUTHOR	`Philippe DELEHAM (kolotoko(AT)wanadoo.fr), Oct 05 2009`

page 1

Search completed in 0.005 seconds

Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

AT&T Labs Research