Number of (n+2)X(3+2) 0..3 arrays with every 3X3 subblock row and column sum not equal to 0 1 3 6 or 7 and every 3X3 diagonal and antidiagonal sum equal to 0 1 3 6 or 7.
A252152
Number of (n+2)X(3+2) 0..3 arrays with every 3X3 subblock row and column sum not equal to 0 1 3 6 or 7 and every 3X3 diagonal and antidiagonal sum equal to 0 1 3 6 or 7.
Terms
- a(0) =2591a(1) =1898a(2) =3197a(3) =4988a(4) =9572a(5) =17803a(6) =35924a(7) =68613a(8) =140294a(9) =268864a(10) =553258a(11) =1064524a(12) =2194400a(13) =4229940a(14) =8737784a(15) =16851232a(16) =34844104a(17) =67252048a(18) =139112864a(19) =268589808a(20) =555851264a(21) =1073324704a(22) =2221749568a(23) =4290919264a(24) =8882898080a(25) =17157089760
External references
- oeis: A252152