Number of (n+1) X (4+1) 0..2 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.
A250894
Number of (n+1) X (4+1) 0..2 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) =1229a(1) =3867a(2) =12387a(3) =39003a(4) =119359a(5) =357335a(6) =1052787a(7) =3069907a(8) =8903447a(9) =25780959a(10) =74735755a(11) =217269563a(12) =634036815a(13) =1857880039a(14) =5466025571a(15) =16140988131a(16) =47817974983a(17) =142048148015a(18) =422912961915
External references
- oeis: A250894