A052313 Triangle read by rows: matrix square of A047996.
1, 2, 1, 3, 2, 1, 4, 3, 2, 1, 6, 5, 5, 2, 1, 8, 7, 8, 5, 2, 1, 14, 13, 18, 13, 7, 2, 1, 20, 19, 30, 25, 16, 7, 2, 1, 36, 35, 64, 59, 44, 21, 9, 2, 1, 60, 59, 120, 129, 102, 57, 28, 9, 2, 1, 108, 107, 244, 291, 260, 159, 86, 33, 11, 2, 1, 188, 187, 470, 629, 620, 417, 246, 107
Offset: 0
Examples
1; 2,1; 3,2,1; 4,3,2,1; 6,5,5,2,1; ...