Number of (4+2)X(n+2) 0..1 arrays with every 3X3 subblock diagonal sum plus antidiagonal sum nondecreasing horizontally, vertically and ne-to-sw antidiagonally.
A253844
Number of (4+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) =28540a(1) =60741a(2) =127483a(3) =284109a(4) =550535a(5) =1139506a(6) =2282367a(7) =3961764a(8) =7017601a(9) =11724584a(10) =19539618a(11) =31606976a(12) =50006761a(13) =77854867a(14) =120313578a(15) =181644323a(16) =270602340a(17) =398497028a(18) =582088318a(19) =838410249a(20) =1195117989a(21) =1688481842
External references
- oeis: A253844