Number of (n+2)X(2+2) 0..3 arrays with every 3X3 subblock row and column sum equal to 0 3 5 6 or 7 and every 3X3 diagonal and antidiagonal sum not equal to 0 3 5 6 or 7.
A252142
Number of (n+2)X(2+2) 0..3 arrays with every 3X3 subblock row and column sum equal to 0 3 5 6 or 7 and every 3X3 diagonal and antidiagonal sum not equal to 0 3 5 6 or 7.
Terms
- a(0) =3026a(1) =2543a(2) =3073a(3) =3797a(4) =5511a(5) =7997a(6) =11573a(7) =16734a(8) =25572a(9) =37796a(10) =57507a(11) =85674a(12) =130391a(13) =193869a(14) =301261a(15) =451687a(16) =701066a(17) =1062950a(18) =1657016a(19) =2508639a(20) =3954332a(21) =6021763a(22) =9489231a(23) =14573849a(24) =23053799a(25) =35426048a(26) =56393822a(27) =87032798a(28) =138567723
External references
- oeis: A252142