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A024721
a(n) = (1/5)*(4 + sum of C(5k,k)) for k = 0,1,2,...,n.
1
1, 2, 11, 102, 1071, 11697, 130452, 1475356, 16856293, 194088920, 2248544554, 26179257724, 306051026719, 3590265729775, 42241017111607, 498243554454823, 5889887780556528, 69761293355975193, 827690921897694948
OFFSET
0,2
LINKS
MATHEMATICA
(Accumulate[Table[Binomial[5n, n], {n, 0, 20}]]+4)/5 (* Harvey P. Dale, Jul 27 2021 *)
CROSSREFS
Sequence in context: A130150 A115941 A351622 * A367852 A285199 A339081
KEYWORD
nonn
EXTENSIONS
More terms from James A. Sellers, May 01 2000
STATUS
approved