Number of (n+1)X(3+1) 0..1 arrays x(i,j) with row sums sum{j^3*x(i,j), j=1..3+1} nondecreasing, and column sums sum{i^3*x(i,j), i=1..n+1} nondecreasing.

A232856

Number of (n+1)X(3+1) 0..1 arrays x(i,j) with row sums sum{j^3*x(i,j), j=1..3+1} nondecreasing, and column sums sum{i^3*x(i,j), i=1..n+1} nondecreasing.

Terms

    a(0) =25a(1) =130a(2) =650a(3) =2942a(4) =11445a(5) =37040a(6) =101369a(7) =257799a(8) =633068a(9) =1515898a(10) =3535659a(11) =7923813a(12) =16924203a(13) =34435189a(14) =67351417a(15) =127875041a(16) =237092930a(17) =430410822a(18) =764368249a(19) =1325374142a(20) =2247755925a(21) =3735891528a(22) =6105155090a(23) =9831802225

External references