A222821 T(n,k)=Number of idempotent n X n 0..k matrices.

2, 2, 8, 2, 12, 50, 2, 16, 122, 452, 2, 20, 218, 2052, 5682, 2, 24, 344, 5584, 54182, 96608, 2, 28, 488, 12476, 248442, 2236302, 2185738, 2, 32, 668, 23568, 855192, 20394466, 145121216, 65108492, 2, 36, 860, 41668, 2319872, 126252320

Offset: 1

Author

R. H. Hardin Apr 09 2013

Keywords

• nonn
• tabl

Comments

Table starts

........2.........2........2.........2.......2.....2...2..2.2

........8........12.......16........20......24....28..32.36

.......50.......122......218.......344.....488...668.860

......452......2052.....5584.....12476...23568.41668

.....5682.....54182...248442....855192.2319872

....96608...2236302.20394466.126252320

..2185738.145121216

.65108492

Examples

			Some solutions for n=3 k=4
..0..2..0....1..0..0....0..0..3....1..0..0....0..0..0....0..3..0....1..4..1
..0..1..0....3..0..2....0..0..4....0..1..0....4..1..0....0..1..0....0..0..0
..0..2..0....0..0..1....0..0..1....4..2..0....0..0..0....0..2..0....0..0..0