OFFSET
0,2
LINKS
FORMULA
a(n) = (F(4n+1) - F(n+1)^4)/F(n)^2 for n > 0 and a(0) = 0, where F(n) = A000045(n).
From Stefano Spezia, Jul 28 2020: (Start)
O.g.f.: 2*x*(2 + 5*x - 3*x^2)/(1 - 2*x - 2*x^2 + x^3).
a(n) = 2*a(n-1) + 2*a(n-2) - a(n-2) for n > 3. (End)
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Michael Tulskikh, Jul 28 2020
STATUS
approved