OFFSET
1,4
LINKS
Harry J. Smith, Table of n, a(n) for n = 1..100
FORMULA
a(n) = floor(2*(n-1)! / (n+1)).
EXAMPLE
a(6) = floor(720/21) = 34.
MAPLE
a:=n->floor(mul(j, j=1..n)/sum(j, j=1..n)):seq(a(n), n=1..23); # Zerinvary Lajos, Dec 07 2008
MATHEMATICA
Table[ Floor[2*(n - 1)!/(n + 1)], {n, 1, 24} ]
PROG
(PARI) { default(realprecision, 100); for (n=1, 100, if (n==1, f=2, f*=(n - 1)); write("b061370.txt", n, " ", f\(n + 1)) ) } \\ Harry J. Smith, Jul 22 2009
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Amarnath Murthy, May 02 2001
EXTENSIONS
More terms from Larry Reeves (larryr(AT)acm.org), May 07 2001
STATUS
approved