OFFSET
0,2
LINKS
G. C. Greubel, Table of n, a(n) for n = 0..650
FORMULA
a(n) = Sum_{k=0..n} A117418(n+k+1, 2*k+1). - G. C. Greubel, May 31 2021
MATHEMATICA
PROG
(Sage)
@CachedFunction
def A117418(n, k):
if (k<0 or k>n): return 0
elif (k==0 or k==n): return 1
elif (k==n-1): return n
[sum(A117418(n+k+1, 2*k+1) for k in (0..n)) for n in (0..30)] # G. C. Greubel, May 31 2021
CROSSREFS
KEYWORD
nonn
AUTHOR
Paul D. Hanna, Mar 14 2006
STATUS
approved