OFFSET
2,1
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 2..1000
FORMULA
Numerators of sequence a[ n, n-1 ] in (a[ i, j ])^2 where a[ i, j ] = A(i, j)/i! if j <= i, 0 if j > i.
a(n) = (n+1)*(2^n - n - 1). - Vladeta Jovovic, Aug 18 2002
G.f.: x^2*(-3+5*x)/((2*x-1)^2*(x-1)^3). - Maksym Voznyy (voznyy(AT)mail.ru), Aug 14 2009; corrected by R. J. Mathar, Sep 16 2009
a(n) = Sum_{k=0..n} Sum_{i=0..n} (i-k) * C(n-k,i-2). - Wesley Ivan Hurt, Sep 19 2017
MATHEMATICA
Table[(n + 1) (2^n - n - 1), {n, 2, 35}] (* Vincenzo Librandi, Sep 04 2017 *)
PROG
(Magma) [(n+1)*(2^n-n-1): n in [2..30]]; // Vincenzo Librandi, Sep 04 2017
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
EXTENSIONS
More terms from Vladeta Jovovic, Aug 18 2002
STATUS
approved