Number of (n+1) X (4+1) 0..1 arrays with nondecreasing x(i,j)-x(i,j-1) in the i direction and nondecreasing absolute value of x(i,j)-x(i-1,j) in the j direction.
A250765
Number of (n+1) X (4+1) 0..1 arrays with nondecreasing x(i,j)-x(i,j-1) in the i direction and nondecreasing absolute value of x(i,j)-x(i-1,j) in the j direction.
Terms
- a(0) =68a(1) =114a(2) =196a(3) =350a(4) =648a(5) =1234a(6) =2396a(7) =4710a(8) =9328a(9) =18554a(10) =36996a(11) =73870a(12) =147608a(13) =295074a(14) =589996a(15) =1179830a(16) =2359488a(17) =4718794a(18) =9437396a(19) =18874590a(20) =37748968a(21) =75497714a(22) =150995196a(23) =301990150a(24) =603980048a(25) =1207959834a(26) =2415919396a(27) =4831838510
External references
- oeis: A250765