Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).
%I #8 Aug 08 2024 07:28:56
%S 1,11,105,1020,10500,115920,1375920,17539200,239500800,3492720000,
%T 54226972800,893577484800,15583119552000,286816578048000,
%U 5557616064000000,113108602134528000,2412627824775168000
%N One half of third column of triangle A075181.
%C Also one half of third diagonal of triangle A048594.
%F a(n) = A075181(n+3, 2)/2 = A048594(n+3, n+1)/2, n>=0.
%F a(n) = (n+1)!*S1(n+3, n+1)/2 with S1(n, m) := A008275(n, m) (Stirling1).
%Y Cf. A008275, A048594, A075181.
%K nonn,easy
%O 0,2
%A _Wolfdieter Lang_, Sep 19 2002