Number of (n+2) X (2+2) 0..3 arrays with every 3 X 3 subblock row and diagonal sum equal to 2 3 4 6 or 7 and every 3 X 3 column and antidiagonal sum not equal to 2 3 4 6 or 7.
A252401
Number of (n+2) X (2+2) 0..3 arrays with every 3 X 3 subblock row and diagonal sum equal to 2 3 4 6 or 7 and every 3 X 3 column and antidiagonal sum not equal to 2 3 4 6 or 7.
Terms
- a(0) =661a(1) =442a(2) =688a(3) =1224a(4) =2414a(5) =5061a(6) =10129a(7) =21427a(8) =46070a(9) =93671a(10) =200430a(11) =433693a(12) =885001a(13) =1898578a(14) =4117127a(15) =8413072a(16) =18067521a(17) =39215676a(18) =80182777a(19) =172284095a(20) =374104916a(21) =765132570a(22) =1644394003a(23) =3571453244a(24) =7305450882a(25) =15702421450a(26) =34107480805
External references
- oeis: A252401