Number of (n+2) X (2+2) 0..3 arrays with every 3 X 3 subblock row and diagonal sum equal to 0 2 4 6 or 7 and every 3 X 3 column and antidiagonal sum not equal to 0 2 4 6 or 7.
A252427
Number of (n+2) X (2+2) 0..3 arrays with every 3 X 3 subblock row and diagonal sum equal to 0 2 4 6 or 7 and every 3 X 3 column and antidiagonal sum not equal to 0 2 4 6 or 7.
Terms
- a(0) =915a(1) =688a(2) =914a(3) =1801a(4) =2993a(5) =6164a(6) =13139a(7) =26670a(8) =55677a(9) =119785a(10) =248291a(11) =522400a(12) =1128516a(13) =2346628a(14) =4950707a(15) =10715161a(16) =22309343a(17) =47111547a(18) =102054851a(19) =212611950a(20) =449193290a(21) =973471926a(22) =2028637174a(23) =4287035224a(24) =9292670275a(25) =19367979783
External references
- oeis: A252427