A128623 - OEIS

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A128623 as a triangular array

													1
												2		2
											6		3		3
										8		8		4		4
									15		10		10		5		5
								18		18		12		12		6		6
							28		21		21		14		14		7		7
						32		32		24		24		16		16		8		8
					45		36		36		27		27		18		18		9		9
				50		50		40		40		30		30		20		20		10		10
			66		55		55		44		44		33		33		22		22		11		11
		72		72		60		60		48		48		36		36		24		24		12		12
	91		78		78		65		65		52		52		39		39		26		26		13		13

A128623 as a square array

1	2	6	8	15	18	28	32	45	50	66	72	91
2	3	8	10	18	21	32	36	50	55	72	78
3	4	10	12	21	24	36	40	55	60	78
4	5	12	14	24	27	40	44	60	65
5	6	14	16	27	30	44	48	65
6	7	16	18	30	33	48	52
7	8	18	20	33	36	52
8	9	20	22	36	39
9	10	22	24	39
10	11	24	26
11	12	26
12	13
13

A128623 as an upper right triangle

1	2	6	8	15	18	28	32	45	50	66	72	91
	2	3	8	10	18	21	32	36	50	55	72	78
		3	4	10	12	21	24	36	40	55	60	78
			4	5	12	14	24	27	40	44	60	65
				5	6	14	16	27	30	44	48	65
					6	7	16	18	30	33	48	52
						7	8	18	20	33	36	52
							8	9	20	22	36	39
								9	10	22	24	39
									10	11	24	26
										11	12	26
											12	13
												13