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A093969 n*Pell(n-2). 2
0, 1, 0, 3, 8, 25, 72, 203, 560, 1521, 4080, 10835, 28536, 74633, 194040, 501915, 1292512, 3315425, 8474976, 21597091, 54884200, 139127289, 351877416, 888121195, 2237336592, 5626467025, 14126832720, 35416929267, 88670846936 (list; graph; refs; listen; history; internal format)
OFFSET

0,4

COMMENTS

The signed version (-1)^(n+1)*n*Pell(n-2) is the second inverse binomial transform of A093967.

FORMULA

G.f.: x(1-4x+5x^2)/(1-2x-x^2)^2; a(n)=n(1+sqrt(2))^n(3sqrt(2)/4-1)-n(1-sqrt(2))^n(3sqrt(2)/4+1).

CROSSREFS

Cf. A000129.

Sequence in context: A018789 A203413 A141799 * A006177 A148788 A022553

Adjacent sequences:  A093966 A093967 A093968 * A093970 A093971 A093972

KEYWORD

easy,nonn

AUTHOR

Paul Barry (pbarry(AT)wit.ie), Apr 21 2004

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Last modified February 13 23:23 EST 2012. Contains 205567 sequences.