Number of (n+2) X (1+2) 0..3 arrays with every 3 X 3 subblock row and column sum not equal to 2 3 4 6 or 7 and every 3 X 3 diagonal and antidiagonal sum equal to 2 3 4 6 or 7.
A252271
Number of (n+2) X (1+2) 0..3 arrays with every 3 X 3 subblock row and column sum not equal to 2 3 4 6 or 7 and every 3 X 3 diagonal and antidiagonal sum equal to 2 3 4 6 or 7.
Terms
- a(0) =206a(1) =185a(2) =232a(3) =322a(4) =535a(5) =852a(6) =1260a(7) =2221a(8) =3676a(9) =5538a(10) =9911a(11) =16558a(12) =25052a(13) =44989a(14) =75320a(15) =114066a(16) =204999a(17) =343366a(18) =520108a(19) =934893a(20) =1566072a(21) =2372290a(22) =4264343a(23) =7143510a(24) =10821116a(25) =19451805a(26) =32585288a(27) =49360882a(28) =88730215a(29) =148639302
External references
- oeis: A252271