A080251 - OEIS

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A080251 as a triangular array

											1
										2		2
									3		3		4
								4		4		6		6
							5		5		8		8		9
						6		6		10		10		12		12
					7		7		12		12		15		15		16
				8		8		14		14		18		18		20		20
			9		9		16		16		21		21		24		24		25
		10		10		18		18		24		24		28		28		30		30
	11		11		20		20		27		27		32		32		35		35		36

A080251 as a square array

1	2	3	4	5	6	7	8	9	10	11
2	3	4	5	6	7	8	9	10	11
4	6	8	10	12	14	16	18	20
6	8	10	12	14	16	18	20
9	12	15	18	21	24	27
12	15	18	21	24	27
16	20	24	28	32
20	24	28	32
25	30	35
30	35
36

A080251 as an upper right triangle

1	2	3	4	5	6	7	8	9	10	11
	2	3	4	5	6	7	8	9	10	11
		4	6	8	10	12	14	16	18	20
			6	8	10	12	14	16	18	20
				9	12	15	18	21	24	27
					12	15	18	21	24	27
						16	20	24	28	32
							20	24	28	32
								25	30	35
									30	35
										36