Number of (n+1)X(2+1) 0..1 arrays with 2X2 subblock sums lexicographically nondecreasing columnwise and rowwise.
A238249
Number of (n+1)X(2+1) 0..1 arrays with 2X2 subblock sums lexicographically nondecreasing columnwise and rowwise.
Terms
- a(0) =44a(1) =180a(2) =804a(3) =2818a(4) =9991a(5) =29995a(6) =90225a(7) =241945a(8) =649320a(9) =1605951a(10) =3974215a(11) =9269399a(12) =21628177a(13) =48322967a(14) =107991481a(15) =233776405a(16) =506133563a(17) =1070574873a(18) =2264593031a(19) =4710021487a(20) =9796211590a(21) =20129009598a(22) =41359935334a(23) =84255978136a(24) =171637137305
External references
- oeis: A238249