OFFSET
1,3
COMMENTS
Conjectured convergent of a(n)/a(n-1) = (1+sqrt(2)). E.g.: a(19)/a(18) = 2653699/1099137 = 2.4143478...
FORMULA
PROG
(Python)
a = [1]
for n in range(30):
a.append(2*sum(a[n//2:-1]) + a[-1])
print(a) # Andrey Zabolotskiy, Aug 28 2024
CROSSREFS
KEYWORD
eigen,nonn
AUTHOR
Gary W. Adamson, Nov 22 2009
EXTENSIONS
Terms a(20) and beyond from Andrey Zabolotskiy, Aug 28 2024
STATUS
approved