Number of n X 4 0..1 arrays with diagonals and antidiagonals unimodal and rows nondecreasing.
A223945
Number of n X 4 0..1 arrays with diagonals and antidiagonals unimodal and rows nondecreasing.
Terms
- a(0) =5a(1) =25a(2) =96a(3) =321a(4) =1062a(5) =3645a(6) =12856a(7) =45626a(8) =161604a(9) =571202a(10) =2018635a(11) =7138542a(12) =25257472a(13) =89382635a(14) =316317650a(15) =1119405165a(16) =3961434035a(17) =14019204346a(18) =49613421418a(19) =175580918227a(20) =621378416037
External references
- oeis: A223945