OFFSET
1,2
LINKS
FORMULA
a(n) = Sum_{j=1..n-1} A007318(j).
EXAMPLE
a(1)=0!/(0!(0-0)!)=1.
MATHEMATICA
Flatten[Table[2^a-1+Sum[Binomial[a, p], {p, 0, b}], {a, 0, 10}, {b, 0, a}]] (* Frank M Jackson, Apr 25 2011 *)
Accumulate[Flatten[Table[Binomial[n, k], {n, 0, 11}, {k, 0, n}]]] (* Harvey P. Dale, Dec 04 2012 *)
PROG
(Haskell)
a163866 n = a163866_list !! (n-1)
a163866_list = scanl1 (+) $ concat a007318_tabl
-- Reinhard Zumkeller, Jul 18 2015
(PARI) lista(nn) = {my(i=0, j=0, p=0); for (n=1, nn, p += binomial(i, j); print1(p, ", "); j++; if (j > i, j = 0; i++); ); } \\ Michel Marcus, Jan 25 2019
CROSSREFS
KEYWORD
nonn
AUTHOR
Juri-Stepan Gerasimov, Aug 06 2009
EXTENSIONS
Entries checked by R. J. Mathar, Aug 11 2009
STATUS
approved