|
Search: id:A113857
|
|
| |
|
| 126, 2772, 48048, 772200, 12033450, 184940756, 2824549728, 43028530272
(list; graph; listen)
|
|
|
OFFSET
|
0,1
|
|
|
COMMENT
|
If one uses the "table" view of array A062190, the sequence appears as the fourth column right from the middle in the "formatted as a triangular array" subpanel.
|
|
FORMULA
|
C(4+2*n,n)*C(9+2*n,4+n).
a(n)=A002694(n+2)*A001700(n+4). - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Nov 28 2008
|
|
EXAMPLE
|
if n=0 then C(4+2*n,n)*C(9+2*n,4+n)=C(4,0)*C(9,4)=1*126=126
if n=7 then C(4+2*7,7)*C(9+2*7,4+7)=C(18,7)*C(23,11)=31824*1352078=43028530272
|
|
CROSSREFS
|
Sequence in context: A027814 A109146 A133499 this_sequence A008397 A086024 A036403
Adjacent sequences: A113854 A113855 A113856 this_sequence A113858 A113859 A113860
|
|
KEYWORD
|
easy,nonn
|
|
AUTHOR
|
Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Feb 02 2006
|
|
EXTENSIONS
|
Rephrased definition. - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Nov 28 2008
|
|
|
Search completed in 0.002 seconds
|
