Number of (n+2)X(2+2) 0..3 arrays with every 3X3 subblock row and column sum equal to 2 3 4 6 or 7 and every 3X3 diagonal and antidiagonal sum not equal to 2 3 4 6 or 7.
A252161
Number of (n+2)X(2+2) 0..3 arrays with every 3X3 subblock row and column sum equal to 2 3 4 6 or 7 and every 3X3 diagonal and antidiagonal sum not equal to 2 3 4 6 or 7.
Terms
- a(0) =3712a(1) =1930a(2) =1574a(3) =2075a(4) =3749a(5) =6883a(6) =12842a(7) =26127a(8) =53376a(9) =107547a(10) =227592a(11) =478345a(12) =987231a(13) =2115771a(14) =4499673a(15) =9415660a(16) =20325117a(17) =43552188a(18) =92035081a(19) =199645934a(20) =430071873a(21) =915400011a(22) =1992467987a(23) =4308311421a(24) =9218109146a(25) =20111437177
External references
- oeis: A252161