Number of n X 4 0..1 arrays with rows unimodal and antidiagonals nondecreasing.
A224405
Number of n X 4 0..1 arrays with rows unimodal and antidiagonals nondecreasing.
Terms
- a(0) =11a(1) =56a(2) =228a(3) =884a(4) =3436a(5) =13440a(6) =52700a(7) =206708a(8) =810664a(9) =3178940a(10) =12465596a(11) =48881440a(12) =191679756a(13) =751638532a(14) =2947419144a(15) =11557788332a(16) =45321842028a(17) =177721660896a(18) =696904347580
External references
- oeis: A224405