Number of threshold functions on n X n grid.

Terms

a(0) =1a(1) =2a(2) =14a(3) =58a(4) =174a(5) =402a(6) =838a(7) =1498a(8) =2566a(9) =4082a(10) =6214a(11) =8986a(12) =12790a(13) =17490a(14) =23646a(15) =31114a(16) =40150a(17) =50914a(18) =64174a(19) =79450a(20) =97870a(21) =118914a(22) =143110a(23) =170506a(24) =202502a(25) =238082a(26) =278702a(27) =323866a(28) =374510a(29) =430274