Number of (n+2)X(2+2) 0..1 arrays with every 3X3 subblock diagonal sum plus antidiagonal sum nondecreasing horizontally, vertically and ne-to-sw antidiagonally.
A253835
Number of (n+2)X(2+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) =19970a(3) =60741a(4) =129378a(5) =265117a(6) =517697a(7) =920743a(8) =1570681a(9) =2618604a(10) =4231022a(11) =6636278a(12) =10253068a(13) =15585443a(14) =23416148a(15) =34730393a(16) =51160002a(17) =74729961a(18) =108671350a(19) =156842600a(20) =225956004a(21) =324026686a(22) =464035121a(23) =661461991a(24) =943337179
External references
- oeis: A253835