A089840 - OEIS

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A089840 as a triangular array

														0
													1		0
												2		1		0
											3		3		1		0
										4		2		2		1		0
									5		7		3		2		1		0
								6		8		4		3		2		1		0
							7		6		6		5		3		2		1		0
						8		4		5		4		5		3		2		1		0
					9		5		7		6		6		6		3		2		1		0
				10		17		8		7		4		5		6		3		2		1		0
			11		18		9		8		7		4		4		4		3		2		1		0
		12		20		10		12		8		7		5		5		4		3		2		1		0
	13		21		14		13		12		8		7		6

A089840 as a square array

0	1	2	3	4	5	6	7	8	9	10	11	12	13
0	1	3	2	7	8	6	4	5	17	18	20	21
0	1	2	3	4	6	5	7	8	9	10	14
0	1	2	3	5	4	6	7	8	12	13
0	1	2	3	5	6	4	7	8	12
0	1	2	3	6	5	4	7	8
0	1	2	3	6	4	5	7
0	1	2	3	4	5	6
0	1	2	3	4
0	1	2	3
0	1	2
0	1
0

A089840 as an upper right triangle

0	1	2	3	4	5	6	7	8	9	10	11	12	13
	0	1	3	2	7	8	6	4	5	17	18	20	21
		0	1	2	3	4	6	5	7	8	9	10	14
			0	1	2	3	5	4	6	7	8	12	13
				0	1	2	3	5	6	4	7	8	12
					0	1	2	3	6	5	4	7	8
						0	1	2	3	6	4	5	7
							0	1	2	3	4	5	6
								0	1	2	3	4
									0	1	2	3
										0	1	2
											0	1
												0