A187881 - OEIS

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A187881 as a triangular array

											1
										0		2
									0		2		3
								0		0		3		4
							0		0		3		4		5
						0		0		0		4		5		6
					0		0		0		4		5		6		7
				0		0		0		0		5		6		7		8
			0		0		0		0		5		6		7		8		9
		0		0		0		0		0		6		7		8		9		10
	0		0		0		0		0		6		7		8		9		10		11

A187881 as a square array

1	0	0	0	0	0	0	0	0	0	0
2	2	0	0	0	0	0	0	0	0
3	3	3	0	0	0	0	0	0
4	4	4	4	0	0	0	0
5	5	5	5	5	0	0
6	6	6	6	6	6
7	7	7	7	7
8	8	8	8
9	9	9
10	10
11

A187881 as an upper right triangle

1	0	0	0	0	0	0	0	0	0	0
	2	2	0	0	0	0	0	0	0	0
		3	3	3	0	0	0	0	0	0
			4	4	4	4	0	0	0	0
				5	5	5	5	5	0	0
					6	6	6	6	6	6
						7	7	7	7	7
							8	8	8	8
								9	9	9
									10	10
										11