|
Search: id:A134772
|
|
|
| A134772 |
|
Let f(M,N)=2^(-M)*sum_{i=0..N} {(-1)^{i}M!N!(2M-2i)!}/{i!(M-i)!(N-i)!6^{N-i}}; then a(n) = f(2n,n). |
|
+0 5
|
|
| 1, 0, 28, 14400, 27165600, 134289792000, 1445549490000000, 29865588836219136000, 1081114481157129619200000, 64007711015400701105356800000, 5873237165016878140678626432000000, 799901135455942846519287494400000000000, 156064894765355001368149078831725782016000000
(list; graph; listen)
|
|
|
|
|
Search completed in 0.006 seconds
|