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A114311 a(n) = n! - n(n-1)/2. 1
1, 1, 1, 3, 18, 110, 705, 5019, 40292, 362844, 3628755, 39916745, 479001534, 6227020722, 87178291109, 1307674367895, 20922789887880, 355687428095864, 6402373705727847, 121645100408831829, 2432902008176639810, 51090942171709439790, 1124000727777607679769 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,4

COMMENTS

Largest term in the factor partition of A114310(n).

LINKS

Table of n, a(n) for n=0..22.

EXAMPLE

a(6) = 705*A114310(6) = 84600 = 1*2*3*4*5*705.

MAPLE

a:=n->sum((n!)-j, j=0..n):a(-1):=1: seq(a(n), n=-1..21); # Zerinvary Lajos, May 26 2008

MATHEMATICA

Table[n!-n(n-1)/2, {n, 0, 30}] (* Harvey P. Dale, Aug 27 2013 *)

CROSSREFS

Cf. A114310.

Sequence in context: A037767 A037655 A074571 * A134092 A000274 A207321

Adjacent sequences:  A114308 A114309 A114310 * A114312 A114313 A114314

KEYWORD

nonn

AUTHOR

Amarnath Murthy, Nov 26 2005

STATUS

approved

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Last modified January 19 17:59 EST 2020. Contains 331051 sequences. (Running on oeis4.)