Number of (5+1)X(n+1) 0..1 arrays with every 2X2 subblock sum nondecreasing horizontally, vertically and antidiagonally ne-to-sw.
A253330
Number of (5+1)X(n+1) 0..1 arrays with every 2X2 subblock sum nondecreasing horizontally, vertically and antidiagonally ne-to-sw.
Terms
- a(0) =676a(1) =2042a(2) =6190a(3) =19312a(4) =58505a(5) =173903a(6) =503944a(7) =1397185a(8) =3802746a(9) =9816070a(10) =25016754a(11) =60535988a(12) =145230766a(13) =332520929a(14) =757040896a(15) =1655009001a(16) =3605466139a(17) =7587808715a(18) =15940578578a(19) =32532048134a(20) =66375799304a(21) =132239420396
External references
- oeis: A253330