Number of n X 2 0..1 arrays with rows, columns and antidiagonals unimodal and diagonals nondecreasing.

A223764

Number of n X 2 0..1 arrays with rows, columns and antidiagonals unimodal and diagonals nondecreasing.

Terms

    a(0) =4a(1) =12a(2) =28a(3) =56a(4) =101a(5) =169a(6) =267a(7) =403a(8) =586a(9) =826a(10) =1134a(11) =1522a(12) =2003a(13) =2591a(14) =3301a(15) =4149a(16) =5152a(17) =6328a(18) =7696a(19) =9276a(20) =11089a(21) =13157a(22) =15503a(23) =18151a(24) =21126a(25) =24454a(26) =28162a(27) =32278a(28) =36831a(29) =41851

External references