OFFSET
1,3
LINKS
T. D. Noe, Table of n, a(n) for n = 1..1000
FORMULA
M!! - N!! where M and N positive integers.
EXAMPLE
7!! - 4!! = 7*5*3*1 - 4*2 = 105 - 8 = 97.
9!! - 5!! = 9*7*5*3*1 - 5*3*1 = 945 - 15 = 930.
MATHEMATICA
terms[n_]:=Sort[Union[Flatten[Table[j!!-i!!, {i, n}, {j, i, n}]]]]; terms[12] (* Enrique Pérez Herrero, May 21 2011 *)
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Paolo P. Lava and Giorgio Balzarotti, Nov 02 2005
EXTENSIONS
Extended by T. D. Noe, May 22 2011
STATUS
approved