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a(n) is the number of divisors of n!*(n! + 1)/2.
1

%I #13 Jun 26 2018 04:59:02

%S 1,1,2,4,18,36,96,144,336,1120,960,960,4320,5760,9504,29568,161280,

%T 80640,884736,110592,155520,460800,729600,2188800,929280,1300992,

%U 2040192,1298304,3528000,14112000,71884800,71884800,85708800,243793920

%N a(n) is the number of divisors of n!*(n! + 1)/2.

%H Harry J. Smith, <a href="/A063101/b063101.txt">Table of n, a(n) for n = 0..60</a>

%o (PARI) a(n)={numdiv(n!*(n! + 1)/2)}

%Y Cf. A055555.

%K nonn

%O 0,3

%A _Jason Earls_, Aug 07 2001