A228726 Number a(n) of columns in each row of the irregular triangles in A187800 and A228594.
1, 1, 1, 2, 1, 1, 2, 1, 2, 9, 1, 1, 3, 1, 3, 9, 1, 5, 9, 28, 1, 1, 3, 1, 3, 10, 1, 5, 11, 28, 1, 5, 12, 28
Offset: 1
Keywords
Examples
a(9) = 9 because there are 9 elements in the 9th rows of A187800 and A228594.