%I #3 May 23 2021 16:38:10

%S 1,2,3,10,33,196,1153,9226,82947,829474,8294401,99533004,1194393601,

%T 16721511554,250822656035,4013162505226,64210599936001,

%U 1155790798931140,20804234379264001,416084687586109482,8737778439290881155,192231125664407654402,4229084764616785920001

%N a(n) = Sum_{d|n} phi(d!).

%e a(6) = Sum_{d|6} phi(d!) = phi(1!) + phi(2!) + phi(3!) + phi(6!) = 1 + 1 + 2 + 192 = 196.

%t Table[Sum[EulerPhi[k!] (1 - Ceiling[n/k] + Floor[n/k]), {k, n}], {n, 30}]

%Y Cf. A000010 (phi).

%K nonn

%O 1,2

%A _Wesley Ivan Hurt_, May 23 2021