Number of n X 3 1..3 arrays containing at least one of each value, all equal values connected, rows considered as a single number in nondecreasing order, and columns considered as a single number in increasing order.
A166819
Number of n X 3 1..3 arrays containing at least one of each value, all equal values connected, rows considered as a single number in nondecreasing order, and columns considered as a single number in increasing order.
Terms
- a(0) =1a(1) =14a(2) =83a(3) =308a(4) =877a(5) =2106a(6) =4487a(7) =8744a(8) =15897a(9) =27334a(10) =44891a(11) =70940a(12) =108485a(13) =161266a(14) =233871a(15) =331856a(16) =461873a(17) =631806a(18) =850915a(19) =1129988a(20) =1481501
External references
- oeis: A166819