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A083862 Main diagonal of array A083857. 1
0, 1, 3, 10, 39, 171, 819, 4229, 23247, 135088, 824163, 5255361, 34876647, 240130801, 1710323667, 12572548582, 95183606559, 740843916471, 5918533467075, 48463830575837, 406239439253175, 3481899731310196 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Table of n, a(n) for n=0..21.

FORMULA

a(n)=(((3+sqrt(4n+1))/2)^n-((3-sqrt(4n+1))/2)^n)/sqrt(4n+1)

CROSSREFS

Cf. A083859, A083863.

Sequence in context: A063688 A245378 A221585 * A205543 A137590 A124532

Adjacent sequences:  A083859 A083860 A083861 * A083863 A083864 A083865

KEYWORD

easy,nonn

AUTHOR

Paul Barry, May 06 2003

STATUS

approved

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Last modified July 22 05:47 EDT 2019. Contains 325213 sequences. (Running on oeis4.)