Number of (n+2) X (1+2) 0..3 arrays with every 3 X 3 subblock row, column, diagonal and antidiagonal sum not equal to 2 3 4 6 or 7.
A252262
Number of (n+2) X (1+2) 0..3 arrays with every 3 X 3 subblock row, column, diagonal and antidiagonal sum not equal to 2 3 4 6 or 7.
Terms
- a(0) =103a(1) =130a(2) =258a(3) =598a(4) =1342a(5) =2900a(6) =6330a(7) =14024a(8) =31000a(9) =68154a(10) =149830a(11) =330046a(12) =727264a(13) =1601418a(14) =3525492a(15) =7763096a(16) =17096250a(17) =37647546a(18) =82899002a(19) =182544940a(20) =401975946a(21) =885174328a(22) =1949187840a(23) =4292186538a(24) =9451591070a(25) =20812845566a(26) =45830805744
External references
- oeis: A252262