Number of (1+2)X(n+2) 0..3 arrays with every 3X3 subblock row and diagonal sum equal to 1 3 4 6 or 7 and every 3X3 column and antidiagonal sum not equal to 1 3 4 6 or 7.
A252545
Number of (1+2)X(n+2) 0..3 arrays with every 3X3 subblock row and diagonal sum equal to 1 3 4 6 or 7 and every 3X3 column and antidiagonal sum not equal to 1 3 4 6 or 7.
Terms
- a(0) =478a(1) =1048a(2) =2532a(3) =5608a(4) =14824a(5) =38780a(6) =89048a(7) =237360a(8) =622168a(9) =1429760a(10) =3813472a(11) =9997360a(12) =22975424a(13) =61297536a(14) =160682752a(15) =369264512a(16) =985412096a(17) =2582786944a(18) =5935395968a(19) =15842576704a(20) =41517842176a(21) =95410411264a(22) =254720901504
External references
- oeis: A252545