Number of (1+2) X (n+2) 0..3 arrays with every 3 X 3 subblock row and diagonal sum equal to 0 3 4 6 or 7 and every 3 X 3 column and antidiagonal sum not equal to 0 3 4 6 or 7.
A252641
Number of (1+2) X (n+2) 0..3 arrays with every 3 X 3 subblock row and diagonal sum equal to 0 3 4 6 or 7 and every 3 X 3 column and antidiagonal sum not equal to 0 3 4 6 or 7.
Terms
- a(0) =572a(1) =1013a(2) =1758a(3) =3162a(4) =6598a(5) =13038a(6) =24852a(7) =51396a(8) =102832a(9) =196692a(10) =406087a(11) =815173a(12) =1564506a(13) =3229898a(14) =6492686a(15) =12499511a(16) =25777034a(17) =51870487a(18) =100142925a(19) =206228256a(20) =415426219a(21) =804167670a(22) =1653389401a(23) =3334113495a(24) =6470363703a(25) =13279927241
External references
- oeis: A252641