Number of (6+1)X(n+1) 0..1 arrays with every 2X2 subblock sum nondecreasing horizontally, vertically and antidiagonally ne-to-sw.
A253331
Number of (6+1)X(n+1) 0..1 arrays with every 2X2 subblock sum nondecreasing horizontally, vertically and antidiagonally ne-to-sw.
Terms
- a(0) =1482a(1) =4218a(2) =11795a(3) =34660a(4) =98741a(5) =283804a(6) =797324a(7) =2204476a(8) =6007384a(9) =15848356a(10) =41401573a(11) =103902920a(12) =258879782a(13) =618827506a(14) =1471104195a(15) =3361979592a(16) =7651235093a(17) =16796687840a(18) =36764069159a(19) =77918736420a(20) =164848892230a(21) =339025990414
External references
- oeis: A253331