OFFSET
0,3
COMMENTS
Sum_{k>0} k * T(n,k) = A247743(n).
LINKS
Alois P. Heinz, Rows n = 0..145, flattened
Wikipedia, Pentomino
EXAMPLE
T(4,2) = 8:
._______. ._______. ._______.
| ._____| |_. |_. | | ._____|
|_| ._| | | |_. | | |_| ._| |
| ._| ._| | | |_| | | ._| | |
|_|___| | | |_. |_| |_| ._| |
|_______| (*2) |___|___| (*2) |___|___| (*4)
Triangle T(n,k) begins:
00 : 1;
01 : 1;
02 : 5;
03 : 56;
04 : 461, 32, 8;
05 : 3558, 368, 80;
06 : 23966, 3256, 696, 24, 8;
07 : 178127, 29564, 6558, 360, 80;
08 : 1362597, 266672, 61858, 4852, 770, 24, 8;
09 : 10194184, 2361632, 581452, 58732, 8890, 384, 80;
10 : 75684682, 20056764, 5220634, 632044, 97174, 5968, 914, 24, 8;
CROSSREFS
KEYWORD
nonn,tabf
AUTHOR
Alois P. Heinz, Sep 23 2014
STATUS
approved