A025581 - OEIS

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A025581 as a triangular array

														0
													1		0
												2		1		0
											3		2		1		0
										4		3		2		1		0
									5		4		3		2		1		0
								6		5		4		3		2		1		0
							7		6		5		4		3		2		1		0
						8		7		6		5		4		3		2		1		0
					9		8		7		6		5		4		3		2		1		0
				10		9		8		7		6		5		4		3		2		1		0
			11		10		9		8		7		6		5		4		3		2		1		0
		12		11		10		9		8		7		6		5		4		3		2		1		0
	13		12		11		10		9		8		7		6		5		4		3

A025581 as a square array

0	1	2	3	4	5	6	7	8	9	10	11	12	13
0	1	2	3	4	5	6	7	8	9	10	11	12
0	1	2	3	4	5	6	7	8	9	10	11
0	1	2	3	4	5	6	7	8	9	10
0	1	2	3	4	5	6	7	8	9
0	1	2	3	4	5	6	7	8
0	1	2	3	4	5	6	7
0	1	2	3	4	5	6
0	1	2	3	4	5
0	1	2	3	4
0	1	2	3
0	1
0

A025581 as an upper right triangle

0	1	2	3	4	5	6	7	8	9	10	11	12	13
	0	1	2	3	4	5	6	7	8	9	10	11	12
		0	1	2	3	4	5	6	7	8	9	10	11
			0	1	2	3	4	5	6	7	8	9	10
				0	1	2	3	4	5	6	7	8	9
					0	1	2	3	4	5	6	7	8
						0	1	2	3	4	5	6	7
							0	1	2	3	4	5	6
								0	1	2	3	4	5
									0	1	2	3	4
										0	1	2	3
											0	1
												0