Number of (n+1) X (3+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.
A250764
Number of (n+1) X (3+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) =35a(1) =62a(2) =114a(3) =216a(4) =418a(5) =820a(6) =1622a(7) =3224a(8) =6426a(9) =12828a(10) =25630a(11) =51232a(12) =102434a(13) =204836a(14) =409638a(15) =819240a(16) =1638442a(17) =3276844a(18) =6553646a(19) =13107248a(20) =26214450a(21) =52428852a(22) =104857654a(23) =209715256a(24) =419430458a(25) =838860860a(26) =1677721662a(27) =3355443264
External references
- oeis: A250764