|
Search: id:A129981
|
|
| |
|
| 1, 2, 4, 7, 15, 30, 78, 183, 567, 1512, 5352, 15747, 61827, 196962, 842082, 2869107, 13191027, 47650452, 233445012, 888174087, 4604065287, 18353375862, 100102982262, 416337125487, 2378327679087, 10284181259712, 61295935653312
(list; graph; listen)
|
|
|
OFFSET
|
0,2
|
|
|
EXAMPLE
|
0!!=1
1!!=1 -> 1+1=2
2!!=2 -> 2+2=4
3!!=3 -> 4+3=7
4!!=8 -> 7+8=15
5!!=15 -> 15+15=30
|
|
MAPLE
|
P:=proc(n) local i, k, w, sf; sf:=1; for i from 0 by 1 to n do k:=i; w:=i-2; while w>0 do k:=k*w; w:=w-2; od; sf:=sf+k; print(sf); od; end: P(100);
|
|
MATHEMATICA
|
s = 0; lst = {}; Do[s += n!!; AppendTo[lst, s], {n, 0, 26, 1}]; lst [From Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Jul 10 2009]
|
|
CROSSREFS
|
Sequence in context: A115178 A049885 A129682 this_sequence A072964 A030033 A135131
Adjacent sequences: A129978 A129979 A129980 this_sequence A129982 A129983 A129984
|
|
KEYWORD
|
easy,nonn
|
|
AUTHOR
|
Paolo P. Lava & Giorgio Balzarotti (ppl(AT)spl.at), Jun 14 2007
|
|
|
Search completed in 0.002 seconds
|
