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A055226 a(n) = floor(sqrt(n!)). 12

%I #17 Jan 29 2018 10:12:39

%S 1,1,1,2,4,10,26,70,200,602,1904,6317,21886,78911,295259,1143535,

%T 4574143,18859677,80014834,348776576,1559776268,7147792818,

%U 33526120082,160785623545,787685471322,3938427356614,20082117944245,104349745809073,552166953567228,2973510046012910,16286585271694955,90679869067935485

%N a(n) = floor(sqrt(n!)).

%H T. D. Noe, <a href="/A055226/b055226.txt">Table of n, a(n) for n=0..300</a>

%F a(n) = A000196(A000142(n)).

%t Table[Floor[Sqrt[n!]], {n, 0, 100}] (* _Emanuele Munarini_, Jul 07 2011 *)

%o (Maxima) makelist(floor(sqrt(n!)),n,0,24); /* _Emanuele Munarini_, Jul 07 2011 */

%o (PARI) a(n)=sqrtint(n!);

%Y Cf. A000142, A000196.

%K easy,nonn

%O 0,4

%A _Henry Bottomley_, Jun 21 2000

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Last modified March 29 09:14 EDT 2024. Contains 371268 sequences. (Running on oeis4.)