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Self-referential triangle sequence code-golf integer sequence
Challenge
Output the flattened version of the sequence A297359, which starts like the following:
1, 1, 1, 1, 2, 1, 1, 3, 3, 1, 2, 4, 6, 4, 2, 1, 6, 10, 10, 6, 1,
1, 7, 16, 20, 16, 7, 1, 3, 8, 23, 36, 36, 23, 8, 3, 3, 11, 31, 59,
72, 59...