Number of (n+2) X (2+2) 0..3 arrays with every 3 X 3 subblock row, column, diagonal and antidiagonal sum not equal to 1 3 4 6 or 7.
A252363
Number of (n+2) X (2+2) 0..3 arrays with every 3 X 3 subblock row, column, diagonal and antidiagonal sum not equal to 1 3 4 6 or 7.
Terms
- a(0) =152a(1) =276a(2) =834a(3) =2338a(4) =6298a(5) =17340a(6) =48034a(7) =132168a(8) =363764a(9) =1002682a(10) =2762622a(11) =7609830a(12) =20965108a(13) =57759930a(14) =159125020a(15) =438382240a(16) =1207732858a(17) =3327264630a(18) =9166496318a(19) =25253399040a(20) =69572290978a(21) =191669348524a(22) =528042715724
External references
- oeis: A252363