Number of (2+1) X (n+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.
A250900
Number of (2+1) X (n+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) =125a(1) =431a(2) =1325a(3) =3867a(4) =11029a(5) =31215a(6) =88421a(7) =251819a(8) =722525a(9) =2089551a(10) =6088189a(11) =17854683a(12) =52646213a(13) =155906639a(14) =463263029a(15) =1380089259a(16) =4119295693a(17) =12312797679a(18) =36841923341a(19) =110320248347a(20) =330524536565a(21) =990650861871
External references
- oeis: A250900