A111966 - OEIS

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A111966

Expansion of 1/(sqrt(1-6x+5x^2)-x).

1, 4, 18, 86, 424, 2128, 10798, 55190, 283510, 1461730, 7557166, 39153338, 203188892, 1055863564, 5492668906, 28598497610, 149012237696, 776904940576, 4052654604042, 21149661562298, 110415949871240, 576636302495488 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,2`
	COMMENTS	`Row sums of number triangle A111965.`
	FORMULA	`a(n)=sum{k=0..n, sum{j=0..n, C((k+2j-1)/2, j)C(j, n-j-k)(-6)^(k-n+2j)5^(n-k-j)}}`
	CROSSREFS	`Sequence in context: A151252 A084847 A082685 * A153294 A164045 A178577` `Adjacent sequences: A111963 A111964 A111965 * A111967 A111968 A111969`
	KEYWORD	`easy,nonn`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Aug 23 2005`

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Last modified February 13 17:27 EST 2012. Contains 205523 sequences.