|
Search: id:A119732
|
|
| |
|
| 1, 1, 1, 1, 2, 1, 1, 4, 4, 1, 1, 11, 20, 11, 1, 1, 67, 276, 276, 67, 1
(list; table; graph; listen)
|
|
|
OFFSET
|
0,5
|
|
|
FORMULA
|
T(n,k) = f(T(n-1,k-1)) + f(T(n-1,k))where f(n) = n*(n+1)/2 = A000217(n); T(0;0) = 1 ; T(n,k) = 0 if k<0 or if k>n.
|
|
EXAMPLE
|
Triangle begins:
1;
1, 1;
1, 2, 1;
1, 4, 4, 1;
1, 11, 20, 11, 1;
1, 67, 276, 276, 67, 1;
|
|
CROSSREFS
|
Cf. A007318.
Adjacent sequences: A119729 A119730 A119731 this_sequence A119733 A119734 A119735
Sequence in context: A117401 A034372 A078121 this_sequence A123521 A123246 A122518
|
|
KEYWORD
|
nonn,tabl
|
|
AUTHOR
|
Philippe DELEHAM (kolotoko(AT)wanadoo.fr), Jun 14 2006
|
|
|
Search completed in 0.002 seconds
|
