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EXAMPLE
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Solutions for n=1,2,... are 1; 2 3; 3 2 4; 4 2 3 5; 5 3 2 4 7
Example triangle for a(4):
4 2 3 5
8 6 15
48 90
4320
Some solutions for a(6) and a(7) are (7,4,3,2,5,8) and (9,7,4,2,3,5,10), and others can be created by interchanging opposite numbers (e.g., swapping 5 and 7 in the second set). - Charlie Neder, Mar 09 2019
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