|
Search: id:A097801
|
|
| |
|
| 2, 2, 6, 30, 210, 1890, 20790, 270270, 4054050, 68918850, 1309458150, 27498621150, 632468286450, 15811707161250, 426916093353750, 12380566707258750, 383797567925021250, 12665319741525701250, 443286190953399543750, 16401589065275783118750, 639661973545755541631250
(list; graph; listen)
|
|
|
OFFSET
|
0,1
|
|
|
REFERENCES
|
Right-hand edge of triangle in A097749.
|
|
FORMULA
|
Contribution from Johannes W. Meijer (meijgia(AT)hotmail.com), Nov 12 2009: (Start)
a(n) = 2*(2*n-1)!!
(End)
|
|
CROSSREFS
|
Contribution from Johannes W. Meijer (meijgia(AT)hotmail.com), Nov 12 2009: (Start)
Equals 2*A001147.
Appears in A167576.
(End)
Sequence in context: A108800 A058250 A067644 this_sequence A164347 A052584 A094303
Adjacent sequences: A097798 A097799 A097800 this_sequence A097802 A097803 A097804
|
|
KEYWORD
|
nonn,new
|
|
AUTHOR
|
N. J. A. Sloane (njas(AT)research.att.com), Sep 21 2004
|
|
|
Search completed in 0.002 seconds
|
