A107972 - OEIS

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A107972 as a triangular array

											1
										3		6
									6		14		20
								10		25		40		50
							15		39		66		90		105
						21		56		98		140		175		196
					28		76		136		200		260		308		336
				36		99		180		270		360		441		504		540
			45		125		230		350		475		595		700		780		825
		55		154		286		440		605		770		924		1056		1155		1210
	66		186		348

A107972 as a square array

1	3	6	10	15	21	28	36	45	55	66
6	14	25	39	56	76	99	125	154	186
20	40	66	98	136	180	230	286	348
50	90	140	200	270	350	440
105	175	260	360	475	605
196	308	441	595	770
336	504	700	924
540	780	1056
825	1155
1210

A107972 as an upper right triangle

1	3	6	10	15	21	28	36	45	55	66
	6	14	25	39	56	76	99	125	154	186
		20	40	66	98	136	180	230	286	348
			50	90	140	200	270	350	440
				105	175	260	360	475	605
					196	308	441	595	770
						336	504	700	924
							540	780	1056
								825	1155
									1210