Nonequivalent ways to place two different markers (e.g., a pair of Go stones, black and white) on an n X n grid.

A242709

Nonequivalent ways to place two different markers (e.g., a pair of Go stones, black and white) on an n X n grid.

Terms

    a(0) =0a(1) =2a(2) =12a(3) =33a(4) =85a(5) =165a(6) =315a(7) =518a(8) =846a(9) =1260a(10) =1870a(11) =2607a(12) =3627a(13) =4823a(14) =6405a(15) =8220a(16) =10540a(17) =13158a(18) =16416a(19) =20045a(20) =24465a(21) =29337a(22) =35167a(23) =41538a(24) =49050a(25) =57200a(26) =66690a(27) =76923a(28) =88711a(29) =101355

External references