OFFSET
0,4
COMMENTS
Sum_{k>0} k * T(n,k) = A247736(n).
LINKS
Alois P. Heinz, Rows n = 0..140, flattened
Wikipedia, Pentomino
EXAMPLE
T(5,5) = 2:
._._._._._. ._________.
| | | | | | |_________|
| | | | | | |_________|
| | | | | | |_________|
| | | | | | |_________|
|_|_|_|_|_| |_________| .
Triangle T(n,k) begins:
00 : 1;
01 : 0, 1;
02 : 4, 0, 1;
03 : 47, 8, 0, 1;
04 : 394, 94, 12, 0, 1;
05 : 2082, 1608, 282, 32, 0, 2;
06 : 15113, 8812, 3452, 512, 58, 0, 3;
07 : 111664, 73863, 22310, 5962, 790, 96, 0, 4;
08 : 789930, 631700, 218608, 45762, 9374, 1260, 142, 0, 5;
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
Alois P. Heinz, Sep 22 2014
STATUS
approved