Number of (2+2)X(n+2) 0..1 arrays with every 3X3 subblock diagonal sum plus antidiagonal sum nondecreasing horizontally, vertically and ne-to-sw antidiagonally.
A253842
Number of (2+2)X(n+2) 0..1 arrays with every 3X3 subblock diagonal sum plus antidiagonal sum nondecreasing horizontally, vertically and ne-to-sw antidiagonally.
Terms
- a(0) =2440a(1) =6339a(2) =17491a(3) =50462a(4) =127376a(5) =308576a(6) =697720a(7) =1437880a(8) =2829830a(9) =5401152a(10) =9898048a(11) =17515235a(12) =30233597a(13) =50992733a(14) =84202870a(15) =136644718a(16) =218184447a(17) =343428681a(18) =534092439a(19) =821689196a(20) =1251051254a(21) =1887950780a(22) =2828007879
External references
- oeis: A253842