A244084 a(n) = denominator( n^n/(2*n)! ).

1, 2, 6, 80, 315, 145152, 30800, 1779148800, 638512875, 975822848000, 3801409387776, 9289262213038080000, 2505147019375, 2386340006666305536000000, 7750482195826656000000, 709859630199578034176, 122529844256906551386796875

Offset

0,2

Comments

Numerators are in A244083.

Links

Vincenzo Librandi, Table of n, a(n) for n = 0..100

Mathematica

Join[{1}, Table[Denominator[n^n/(2 n)!], {n, 1, 20}]]

Prog

(Magma) [Denominator(n^n/Factorial(2*n)): n in [0..20]];

Crossrefs

Cf. A000312, A010050, A244083.

Sequence in context: A076146 A114552 A302343 * A362581 A352284 A352313

Adjacent sequences: A244081 A244082 A244083 * A244085 A244086 A244087

Keyword

nonn,frac

Author

Vincenzo Librandi, Jun 20 2014

Status

approved