Number of (4+2)X(n+2) 0..3 arrays with every 3X3 subblock row and diagonal sum equal to 0 2 5 6 or 7 and every 3X3 column and antidiagonal sum not equal to 0 2 5 6 or 7.
A252683
Number of (4+2)X(n+2) 0..3 arrays with every 3X3 subblock row and diagonal sum equal to 0 2 5 6 or 7 and every 3X3 column and antidiagonal sum not equal to 0 2 5 6 or 7.
Terms
- a(0) =1010a(1) =1677a(2) =4298a(3) =7747a(4) =26744a(5) =78851a(6) =147462a(7) =519311a(8) =1555755a(9) =2915082a(10) =10313664a(11) =30980483a(12) =58079774a(13) =205778379a(14) =618405463a(15) =1159066270a(16) =4109895588a(17) =12351404831a(18) =23142304030a(19) =82115735795a(20) =246768222195a(21) =462191279878
External references
- oeis: A252683