OFFSET
0,2
COMMENTS
Formula was found by Paul D. Hanna.
Related to logarithmic numbers A002104.
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 0..450
FORMULA
a(n) = A087208(n)*(n+1)*(n+2)/2. - Paul D. Hanna
E.g.f.: exp(x)/(1-x^2)*(x^2/2) (with offset 2). - Zerinvary Lajos, Apr 03 2009
MAPLE
a:= n-> (n+1)*(n+2)/2*sum(n!/(n-2*k)!, k=0..floor(n/2)): seq(a(n), n=0..20);
MATHEMATICA
Rest[Rest[With[{nn=25}, CoefficientList[Series[Exp[x]/(1 - x^2)(x^2/2), {x, 0, nn}], x] Range[0, nn]!]]] (* Vincenzo Librandi, Sep 03 2017 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Creighton Dement, Feb 17 2006
EXTENSIONS
More terms from Vincenzo Librandi, Sep 03 2017
STATUS
approved