A091711 - OEIS

A091711

Exponent of 2 in (n^2)!.

0, 3, 7, 15, 22, 34, 46, 63, 78, 97, 116, 142, 165, 193, 221, 255, 286, 321, 356, 397, 435, 479, 526, 574, 620, 672, 723, 781, 836, 896, 956, 1023, 1086, 1153, 1220, 1293, 1363, 1439, 1514, 1597, 1676, 1758, 1842, 1931, 2017, 2113, 2205, 2302, 2396

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OFFSET

1,2

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 1..200

MATHEMATICA

Table[IntegerExponent[(n^2)!, 2], {n, 50}] (* Harvey P. Dale, Nov 15 2018 *)

PROG

(PARI) a(n)=valuation((n*n)!, 2)

(Magma) [Valuation(Factorial(n^2), 2): n in [1..50]]; // Vincenzo Librandi, May 16 2013

CROSSREFS

Cf. A007814(A088020(n)).

Sequence in context: A046932 A015821 A229527 * A103007 A077790 A322971

Adjacent sequences: A091708 A091709 A091710 * A091712 A091713 A091714

KEYWORD

nonn,easy

AUTHOR

Ralf Stephan, Feb 09 2004

STATUS

approved