Number of 2Xn 0..3 arrays with rows and antidiagonals unimodal and columns nondecreasing.
A223865
Number of 2Xn 0..3 arrays with rows and antidiagonals unimodal and columns nondecreasing.
Terms
- a(0) =10a(1) =100a(2) =684a(3) =3526a(4) =14751a(5) =52591a(6) =165212a(7) =468292a(8) =1218812a(9) =2951732a(10) =6721028a(11) =14507390a(12) =29883426a(13) =59065484a(14) =112531519a(15) =207449471a(16) =371243434a(17) =646728936a(18) =1099377792a(19) =1827431562a(20) =2975775445a(21) =4754716769a(22) =7465089922a(23) =11531438986
External references
- oeis: A223865