Number of 4 X n 0..2 arrays with rows unimodal and antidiagonals nondecreasing.

A224376

Number of 4 X n 0..2 arrays with rows unimodal and antidiagonals nondecreasing.

Terms

    a(0) =81a(1) =1944a(2) =15540a(3) =77793a(4) =311367a(5) =1092281a(6) =3518302a(7) =10643789a(8) =30548895a(9) =83538706a(10) =218139823a(11) =544930741a(12) =1304961768a(13) =3002671615a(14) =6654904188a(15) =14242413828a(16) =29504608642a(17) =59301307852a(18) =115889490174a(19) =220645337145a(20) =410024971049

External references