A143540 - OEIS

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A143540 as a triangular array

											0
										0		1
									0		2		1
								0		2		1		0
							0		3		2		0		1
						0		3		2		0		1		0
					0		4		3		0		2		0		1
				0		4		3		0		2		0		1		0
			0		4		3		0		2		0		1		0		0
		0		4		3		0		2		0		1		0		0		0
	0		5		4		0		3		0		2		0		0		0		1

A143540 as a square array

0	0	0	0	0	0	0	0	0	0	0
1	2	2	3	3	4	4	4	4	5
1	1	2	2	3	3	3	3	4
0	0	0	0	0	0	0	0
1	1	2	2	2	2	3
0	0	0	0	0	0
1	1	1	1	2
0	0	0	0
0	0	0
0	0
1

A143540 as an upper right triangle

0	0	0	0	0	0	0	0	0	0	0
	1	2	2	3	3	4	4	4	4	5
		1	1	2	2	3	3	3	3	4
			0	0	0	0	0	0	0	0
				1	1	2	2	2	2	3
					0	0	0	0	0	0
						1	1	1	1	2
							0	0	0	0
								0	0	0
									0	0
										1