|
Search: id:A104881
|
|
|
| A104881 |
|
Number triangle T(n,k)=sum{j=0..k, (n-k)^(k-j)}. |
|
+0
2
|
|
| 1, 1, 1, 1, 2, 1, 1, 3, 3, 1, 1, 4, 7, 4, 1, 1, 5, 13, 15, 5, 1, 1, 6, 21, 40, 31, 6, 1, 1, 7, 31, 85, 121, 63, 7, 1, 1, 8, 43, 156, 341, 364, 127, 8, 1, 1, 9, 57, 259, 781, 1365, 1093, 255, 9, 1, 1, 10, 73, 400, 1555, 3906, 5461, 3280, 511, 10, 1, 1, 11, 91, 585, 2801, 9331, 19531
(list; table; graph; listen)
|
|
|
OFFSET
|
0,5
|
|
|
COMMENT
|
Reverse of triangle A104878. Row sums are A104879. Diagonal sums are A104882.
|
|
FORMULA
|
Number triangle T(n, k)=if(k<=n, sum{j=0..k, (n-k)^(k-j), 0)}.
|
|
EXAMPLE
|
Rows begin {1},{1,1},{1,2,1},{1,3,3,1},{1,4,7,4,1},{1,5,13,15,5,1},..
|
|
CROSSREFS
|
Sequence in context: A101515 A028657 A053534 this_sequence A104878 A135597 A073134
Adjacent sequences: A104878 A104879 A104880 this_sequence A104882 A104883 A104884
|
|
KEYWORD
|
easy,nonn,tabl
|
|
AUTHOR
|
Paul Barry (pbarry(AT)wit.ie), Mar 28 2005
|
|
|
Search completed in 0.002 seconds
|
