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 #7 Apr 09 2014 10:16:40
%S 0,1,3,11,25,137,294,2178,4566,42774,88572,1004532,2064504,27503832,
%T 56243184,860945040,1754322480,30342400560,61664980320,1189277851680,
%U 2412077832000,51324077044800,103928089910400,2418504655996800
%N a(n) = H(n)*n!/(floor(n/2))!, where H(n) = sum{k=1 to n} 1/k, the n-th harmonic number.
%t f[n_] := HarmonicNumber[n]n!/Floor[n/2]!; Table[f@n, {n, 0, 23}] - _Robert G. Wilson v_, Nov 26 2006
%Y Cf. A123989, A124079.
%K easy,nonn
%O 0,3
%A _Leroy Quet_, Nov 24 2006
%E More terms from _Robert G. Wilson v_, Nov 26 2006