Number of n X 3 0..1 arrays with rows unimodal and antidiagonals nondecreasing.
A224404
Number of n X 3 0..1 arrays with rows unimodal and antidiagonals nondecreasing.
Terms
- a(0) =7a(1) =28a(2) =100a(3) =358a(4) =1288a(5) =4636a(6) =16684a(7) =60040a(8) =216064a(9) =777544a(10) =2798128a(11) =10069552a(12) =36237040a(13) =130405312a(14) =469286272a(15) =1688808544a(16) =6077472256a(17) =21870844480a(18) =78706050496a(19) =283237457536
External references
- oeis: A224404