OFFSET
0,2
FORMULA
PROG
(PARI) a(n)=binomial(floor(n*(sqrt(5)+3)/2), n)
(PARI) {a(n)=local(phi=(sqrt(5)+1)/2); binomial(floor(n*phi^2), floor(n*phi))}
(Python)
from math import isqrt, comb
def A135963(n): return comb(n+(n+isqrt(5*n**2)>>1), n) # Chai Wah Wu, Aug 10 2022
CROSSREFS
KEYWORD
nonn
AUTHOR
Paul D. Hanna, Dec 11 2007
STATUS
approved