Number of (n+2) X (1+2) 0..3 arrays with every 3 X 3 subblock row and column sum not equal to 0 2 4 6 or 7 and every 3 X 3 diagonal and antidiagonal sum equal to 0 2 4 6 or 7.
A252516
Number of (n+2) X (1+2) 0..3 arrays with every 3 X 3 subblock row and column sum not equal to 0 2 4 6 or 7 and every 3 X 3 diagonal and antidiagonal sum equal to 0 2 4 6 or 7.
Terms
- a(0) =806a(1) =791a(2) =475a(3) =660a(4) =1093a(5) =1471a(6) =2176a(7) =3809a(8) =6101a(9) =9098a(10) =16197a(11) =27215a(12) =40668a(13) =72707a(14) =123525a(15) =184674a(16) =330481a(17) =562847a(18) =841564a(19) =1506331a(20) =2566837a(21) =3838002a(22) =6870033a(23) =11708143a(24) =17506412a(25) =31336843a(26) =53406693a(27) =79855586a(28) =142943489a(29) =243616831
External references
- oeis: A252516