Number of (n+2)X(2+2) 0..3 arrays with every 3X3 subblock row and column sum not equal to 0 2 5 6 or 7 and every 3X3 diagonal and antidiagonal sum equal to 0 2 5 6 or 7.
A252417
Number of (n+2)X(2+2) 0..3 arrays with every 3X3 subblock row and column sum not equal to 0 2 5 6 or 7 and every 3X3 diagonal and antidiagonal sum equal to 0 2 5 6 or 7.
Terms
- a(0) =1006a(1) =854a(2) =1098a(3) =1704a(4) =3472a(5) =7186a(6) =12214a(7) =28034a(8) =60808a(9) =104972a(10) =247716a(11) =545384a(12) =946098a(13) =2250884a(14) =4981124a(15) =8656564a(16) =20654540a(17) =45800766a(18) =79656236a(19) =190278230a(20) =422299752a(21) =734708854a(22) =1755888982a(23) =3898476014a(24) =6783565818a(25) =16215635648
External references
- oeis: A252417