OFFSET
1,5
COMMENTS
Note that we are counting terms with repetition. For example, to find a(5)=4, we are looking for the number of terms that appear twice. 0 and 1 each occur twice, which is 2+2=4 (not 1+1=2). This means that each column contains only multiples of the number of occurences it is counting.
EXAMPLE
First few rows of irregular triangle:
0;
1, 0;
1, 4, 0;
1, 0, 3, 4, 0;
1, 2, 0, 4, 0;
2, 2, 6, 4, 0;
2, 0, 0, 12, 0;
3, 2, 0, 8, 5, 0;
4, 2, 0, 4, 0, 12, 0;
3, 2, 3, 8, 0, 6, 7, 0;
2, 6, 3, 4, 5, 0, 7, 8, 0;
CROSSREFS
KEYWORD
nonn,tabf
AUTHOR
Neal Gersh Tolunsky, Dec 11 2022
STATUS
approved