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A093146
Third binomial transform of Pell(3n-1).
1
1, 5, 50, 750, 12500, 212500, 3625000, 61875000, 1056250000, 18031250000, 307812500000, 5254687500000, 89703125000000, 1531328125000000, 26141406250000000, 446261718750000000, 7618164062500000000
OFFSET
0,2
FORMULA
G.f.: (1-15*x)/(1 - 20*x + 50*x^2);
a(n) = (10 + 5*sqrt(2))^n*(1/2 - sqrt(2)/4) + (10 - 5*sqrt(2))^n*(1/2 + sqrt(2)/4).
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Paul Barry, Mar 26 2004
STATUS
approved