Number of n X 4 0..3 arrays with rows and antidiagonals unimodal and columns nondecreasing.
A223860
Number of n X 4 0..3 arrays with rows and antidiagonals unimodal and columns nondecreasing.
Terms
- a(0) =130a(1) =3526a(2) =41682a(3) =315124a(4) =1771012a(5) =8008548a(6) =30627033a(7) =102479569a(8) =307435001a(9) =842078930a(10) =2135465204a(11) =5069027730a(12) =11361881611a(13) =24219158218a(14) =49385314943a(15) =96803565005a(16) =183160193142a(17) =335692581558a(18) =597766839750
External references
- oeis: A223860