A094305 - OEIS

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A094305 as a triangular array

											1
										3		3
									6		12		6
								10		30		30		10
							15		60		90		60		15
						21		105		210		210		105		21
					28		168		420		560		420		168		28
				36		252		756		1260		1260		756		252		36
			45		360		1260		2520		3150		2520		1260		360		45
		55		495		1980		4620		6930		6930		4620		1980		495		55
	66

A094305 as a square array

1	3	6	10	15	21	28	36	45	55	66
3	12	30	60	105	168	252	360	495
6	30	90	210	420	756	1260	1980
10	60	210	560	1260	2520	4620
15	105	420	1260	3150	6930
21	168	756	2520	6930
28	252	1260	4620
36	360	1980
45	495
55

A094305 as an upper right triangle

1	3	6	10	15	21	28	36	45	55	66
	3	12	30	60	105	168	252	360	495
		6	30	90	210	420	756	1260	1980
			10	60	210	560	1260	2520	4620
				15	105	420	1260	3150	6930
					21	168	756	2520	6930
						28	252	1260	4620
							36	360	1980
								45	495
									55