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%I #11 Jul 27 2015 21:08:06
%S 0,0,0,1,14,145,1450,15421,180894,2359225,34072850,540848341,
%T 9363767974,175619185105,3547113529050,76761061273261,
%U 1771884886830254,43456922321543785,1128511554354422050,30933862439582514181,892562598747547111734,27041608332832948251265,858281473267724898703850
%N Steffensen's bracket function [n,3].
%D J. F. Steffensen, On a class of polynomials and their application to actuarial problems, Skandinavisk Aktuarietidskrift, 11 (1928), 75-97.
%H J. F. Steffensen, <a href="http://dx.doi.org/10.1080/03461238.1928.10416863">On a class of polynomials and their application to actuarial problems</a>, Skandinavisk Aktuarietidskrift, Vol. 11, pp. 75-97, 1928.
%F See A241168.
%F a(n) ~ (n-1)! / (6*(log(2))^n). - _Vaclav Kotesovec_, Apr 22 2014
%p with(combinat);
%p T:=proc(n,k) add(stirling2(n,s+1)*s!/k!,s=k..n-1); end;
%p [seq(T(n,3),n=1..16)];
%t Flatten[{0,0,0,Table[Sum[StirlingS2[n, s+1]*s!/3!, {s,3,n-1}],{n,4,20}]}] (* _Vaclav Kotesovec_, Apr 22 2014 *)
%Y A diagonal of the triangular array in A241168.
%K nonn
%O 1,5
%A _N. J. A. Sloane_, Apr 22 2014
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