OFFSET
0,4
COMMENTS
Sum_{k>0} k * T(n,k) = A247737(n).
LINKS
Alois P. Heinz, Rows n = 0..140, flattened
Wikipedia, Pentomino
EXAMPLE
T(2,2) = 2:
.___. .___.
| ._| |_. |
| | | | | |
| | | | | |
|_| | | |_|
|___| |___| .
Triangle T(n,k) begins:
00 : 1;
01 : 1, 0;
02 : 3, 0, 2;
03 : 36, 16, 4, 0;
04 : 177, 220, 100, 0, 4;
05 : 1300, 1720, 816, 144, 26, 0;
06 : 8866, 11152, 5616, 1784, 524, 0, 8;
07 : 54849, 85016, 51116, 18380, 4656, 584, 88, 0;
08 : 372943, 622732, 448744, 189360, 52130, 8948, 1908, 0, 16;
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
Alois P. Heinz, Sep 22 2014
STATUS
approved