OFFSET
0,3
COMMENTS
Sum_{k>0} k * T(n,k) = A247744(n).
LINKS
Alois P. Heinz, Rows n = 0..185, flattened
Wikipedia, Pentomino
EXAMPLE
T(3,1) = 1:
._____.
| ._. |
|_| |_|
|_. ._|
| |_| |
|_____|
.
Triangle T(n,k) begins:
00 : 1;
01 : 1;
02 : 5;
03 : 55, 1;
04 : 493, 8;
05 : 3930, 76;
06 : 27207, 734, 9;
07 : 207118, 7414, 157;
08 : 1622723, 71986, 2064, 8;
09 : 12544364, 638499, 22232, 259;
10 : 95912510, 5558790, 222964, 3898, 50;
CROSSREFS
KEYWORD
nonn,tabf
AUTHOR
Alois P. Heinz, Sep 23 2014
STATUS
approved