Number of nX4 0..2 arrays with rows, columns and antidiagonals unimodal and diagonals nondecreasing.

A223929

Number of nX4 0..2 arrays with rows, columns and antidiagonals unimodal and diagonals nondecreasing.

Terms

    a(0) =46a(1) =698a(2) =4498a(3) =21334a(4) =86439a(5) =316136a(6) =1065625a(7) =3337831a(8) =9773219a(9) =26903878a(10) =70024867a(11) =173255292a(12) =409514526a(13) =928832014a(14) =2029581476a(15) =4287303027a(16) =8781854785a(17) =17488776976a(18) =33939319272a(19) =64311697250a(20) =119202262153a(21) =216450903569

External references