Number of (n+1) X (2+1) 0..1 arrays x(i,j) with row sums Sum_{j=1..2+1} x(i,j) nondecreasing, and column sums Sum_{i=1..n+1} i^2*x(i,j) nondecreasing.
A233298
Number of (n+1) X (2+1) 0..1 arrays x(i,j) with row sums Sum_{j=1..2+1} x(i,j) nondecreasing, and column sums Sum_{i=1..n+1} i^2*x(i,j) nondecreasing.
Terms
- a(0) =13a(1) =42a(2) =141a(3) =502a(4) =1739a(5) =5964a(6) =20185a(7) =67609a(8) =224165a(9) =737347a(10) =2407911a(11) =7814616a(12) =25223004a(13) =81015137a(14) =259099567a(15) =825507109a(16) =2621224089a(17) =8298060296a(18) =26197890927a(19) =82506334112a(20) =259260476024
External references
- oeis: A233298