Number of (2+1) X (n+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.
A250770
Number of (2+1) X (n+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) =18a(1) =34a(2) =62a(3) =114a(4) =214a(5) =410a(6) =798a(7) =1570a(8) =3110a(9) =6186a(10) =12334a(11) =24626a(12) =49206a(13) =98362a(14) =196670a(15) =393282a(16) =786502a(17) =1572938a(18) =3145806a(19) =6291538a(20) =12582998a(21) =25165914a(22) =50331742a(23) =100663394a(24) =201326694a(25) =402653290a(26) =805306478a(27) =1610612850a(28) =3221225590
External references
- oeis: A250770