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A093147 Third binomial transform of Pell(3n+1). 1
1, 15, 250, 4250, 72500, 1237500, 21125000, 360625000, 6156250000, 105093750000, 1794062500000, 30626562500000, 522828125000000, 8925234375000000, 152363281250000000, 2601003906250000000, 44401914062500000000 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,2
LINKS
FORMULA
G.f.: (1-5*x)/(1 - 20*x + 50*x^2);
a(n) = ((1 + sqrt(2))*(10 + 5*sqrt(2))^n - (1 - sqrt(2))*(10-5*sqrt(2))^n)/(2*sqrt(2)).
CROSSREFS
Sequence in context: A218806 A285395 A331493 * A218192 A066410 A370317
KEYWORD
easy,nonn
AUTHOR
Paul Barry, Mar 26 2004
STATUS
approved

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Last modified May 27 02:08 EDT 2024. Contains 372847 sequences. (Running on oeis4.)