A219883 - OEIS

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A219883 as a triangular array

											3
										3		6
									6		7		10
								10		11		21		15
							15		17		47		46		21
						21		24		129		146		87		28
					28		32		292		621		410		151		36
				36		41		600		2190		2645		1069		247		45
			45		51		1158		6965		14536		10350		2701		386		55
		55		62		2148		21035		74998		89795		40239		6645		581		66
	66		74

A219883 as a square array

3	3	6	10	15	21	28	36	45	55	66
6	7	11	17	24	32	41	51	62	74
10	21	47	129	292	600	1158	2148
15	46	146	621	2190	6965	21035
21	87	410	2645	14536	74998
28	151	1069	10350	89795
36	247	2701	40239
45	386	6645
55	581
66

A219883 as an upper right triangle

3	3	6	10	15	21	28	36	45	55	66
	6	7	11	17	24	32	41	51	62	74
		10	21	47	129	292	600	1158	2148
			15	46	146	621	2190	6965	21035
				21	87	410	2645	14536	74998
					28	151	1069	10350	89795
						36	247	2701	40239
							45	386	6645
								55	581
									66