OFFSET
0,1
COMMENTS
See A191402.
MATHEMATICA
(See A191402.)
PROG
(Python)
from math import isqrt
def A191404(n): return (n+isqrt(m:=5*n**2)>>1)+(n+3+isqrt(m+30*n+45)>>1) # Chai Wah Wu, Aug 10 2022
CROSSREFS
KEYWORD
nonn
AUTHOR
Clark Kimberling, Jun 01 2011
STATUS
approved