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%I #10 Nov 17 2019 01:43:17
%S 1,1,1,2,5,20,103,630,4480,36288,329891,3326400,36846277,444787200,
%T 5811886080,81729648000,1230752346353,19760412672000,336967037143579,
%U 6082255020441600,115852476579840000,2322315553259520000,48869596859895986087,1077167364120207360000,24817936069329577574400,596585001666576384000000
%N a(n) = ceiling((n-1)! / n).
%C Except for n = 4, this is ((n-1)!+1)/n for prime n, and (n-1)!/n otherwise.
%t Table[Ceiling[((n-1)!)/n],{n,30}] (* _Harvey P. Dale_, Oct 04 2018 *)
%o (PARI) a(n) = ceil((n-1)!/n)
%Y Cf. A007619 (prime index elements).
%K nonn
%O 1,4
%A _Franklin T. Adams-Watters_, Aug 31 2015
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