|
| |
|
|
A122832
|
|
Exponential Riordan array (e^(x(1+x)),x).
|
|
1
| |
|
|
1, 1, 1, 3, 2, 1, 7, 9, 3, 1, 25, 28, 18, 4, 1, 81, 125, 70, 30, 5, 1, 331, 486, 375, 140, 45, 6, 1, 1303, 2317, 1701, 875, 245, 63, 7, 1, 5937, 10424, 9268, 4536, 1750, 392
(list; table; graph; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 0,4
|
|
|
COMMENTS
| Row sums are A000898. Inverse is A122833. Product of A007318 and A067147.
|
|
|
FORMULA
| Number triangle T(n,k)=(n!/k!)sum{i=0..n-k, C(i,n-k-i)/i!}
|
|
|
EXAMPLE
| Triangle begins
1,
1, 1,
3, 2, 1,
7, 9, 3, 1,
25, 28, 18, 4, 1,
81, 125, 70, 30, 5, 1
|
|
|
CROSSREFS
| Sequence in context: A145035 A192020 A171128 * A056151 A134436 A186370
Adjacent sequences: A122829 A122830 A122831 * A122833 A122834 A122835
|
|
|
KEYWORD
| easy,nonn,tabl
|
|
|
AUTHOR
| Paul Barry (pbarry(AT)wit.ie), Sep 12 2006
|
| |
|
|
