Number of (n+2) X (1+2) 0..3 arrays with every 3 X 3 subblock row and column sum not equal to 1 3 4 6 or 7 and every 3 X 3 diagonal and antidiagonal sum equal to 1 3 4 6 or 7.
A252236
Number of (n+2) X (1+2) 0..3 arrays with every 3 X 3 subblock row and column sum not equal to 1 3 4 6 or 7 and every 3 X 3 diagonal and antidiagonal sum equal to 1 3 4 6 or 7.
Terms
- a(0) =342a(1) =858a(2) =2174a(3) =4708a(4) =13376a(5) =34364a(6) =74824a(7) =213344a(8) =548984a(9) =1196176a(10) =3412160a(11) =8782064a(12) =19136800a(13) =54591872a(14) =140509664a(15) =306184768a(16) =873464576a(17) =2248147904a(18) =4898948224a(19) =13975422464a(20) =35970353024a(21) =78383155456a(22) =223606737920
External references
- oeis: A252236