Number of (n+2)X(2+2) 0..1 arrays with every 3X3 subblock diagonal sum plus antidiagonal sum nondecreasing horizontally and vertically.
A253929
Number of (n+2)X(2+2) 0..1 arrays with every 3X3 subblock diagonal sum plus antidiagonal sum nondecreasing horizontally and vertically.
Terms
- a(0) =2440a(1) =8384a(2) =30184a(3) =109666a(4) =299727a(5) =756553a(6) =1786831a(7) =3803056a(8) =7637333a(9) =14786984a(10) =27386267a(11) =48837015a(12) =84729381a(13) =143415507a(14) =237363264a(15) =385677751a(16) =615912715a(17) =969323806a(18) =1506759547a(19) =2315941896a(20) =3521114537a(21) =5307003996a(22) =7939414563
External references
- oeis: A253929