A158823 - OEIS

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A158823 as a triangular array

												1
											3		1
										6		2		2
									10		3		4		3
								15		4		6		6		4
							21		5		8		9		8		5
						28		6		10		12		12		10		6
					36		7		12		15		16		15		12		7
				45		8		14		18		20		20		18		14		8
			55		9		16		21		24		25		24		21		16		9
		66		10		18		24		28		30		30		28		24		18		10
	78		11		20		27		32		35		36		35		32		27		20		11

A158823 as a square array

1	3	6	10	15	21	28	36	45	55	66	78
1	2	3	4	5	6	7	8	9	10	11
2	4	6	8	10	12	14	16	18	20
3	6	9	12	15	18	21	24	27
4	8	12	16	20	24	28	32
5	10	15	20	25	30	35
6	12	18	24	30	36
7	14	21	28	35
8	16	24	32
9	18	27
10	20
11

A158823 as an upper right triangle

1	3	6	10	15	21	28	36	45	55	66	78
	1	2	3	4	5	6	7	8	9	10	11
		2	4	6	8	10	12	14	16	18	20
			3	6	9	12	15	18	21	24	27
				4	8	12	16	20	24	28	32
					5	10	15	20	25	30	35
						6	12	18	24	30	36
							7	14	21	28	35
								8	16	24	32
									9	18	27
										10	20
											11