Number of n X 3 0..2 arrays with diagonals and rows unimodal and antidiagonals nondecreasing.

A224305

Number of n X 3 0..2 arrays with diagonals and rows unimodal and antidiagonals nondecreasing.

Terms

    a(0) =22a(1) =218a(2) =1586a(3) =11361a(4) =82700a(5) =615481a(6) =4634768a(7) =35003328a(8) =264487714a(9) =1997888432a(10) =15087449584a(11) =113921725004a(12) =860155842566

External references