A263439 - OEIS

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A263439 as a triangular array

									1
								2		2
							4		21		4
						6		180		180		6
					9		1225		6945		1225		9
				18		9820		230997		230997		9820		18
			36		90785		9407092		34701974		9407092		90785		36
		61		841164		408471412		7338416019		7338416019		408471412		841164		61
	106		7551453		18332843169

A263439 as a square array

1	2	4	6	9	18	36	61	106
2	21	180	1225	9820	90785	841164	7551453
4	180	6945	230997	9407092	408471412	18332843169
6	1225	230997	34701974	7338416019
9	9820	9407092	7338416019
18	90785	408471412
36	841164
61

A263439 as an upper right triangle

1	2	4	6	9	18	36	61	106
	2	21	180	1225	9820	90785	841164	7551453
		4	180	6945	230997	9407092	408471412	18332843169
			6	1225	230997	34701974	7338416019
				9	9820	9407092	7338416019
					18	90785	408471412
						36	841164
							61