A204006 - OEIS

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A204006 as a triangular array

												1
											2		2
										3		4		3
									4		5		5		4
								5		6		7		6		5
							6		7		8		8		7		6
						7		8		9		10		9		8		7
					8		9		10		11		11		10		9		8
				9		10		11		12		13		12		11		10		9
			10		11		12		13		14		14		13		12		11		10
		11		12		13		14		15		16		15		14		13		12		11
	12		13		14		15		16		17		17		16		15		14		13		12

A204006 as a square array

1	2	3	4	5	6	7	8	9	10	11	12
2	4	5	6	7	8	9	10	11	12	13
3	5	7	8	9	10	11	12	13	14
4	6	8	10	11	12	13	14	15
5	7	9	11	13	14	15	16
6	8	10	12	14	16	17
7	9	11	13	15	17
8	10	12	14	16
9	11	13	15
10	12	14
11	13
12

A204006 as an upper right triangle

1	2	3	4	5	6	7	8	9	10	11	12
	2	4	5	6	7	8	9	10	11	12	13
		3	5	7	8	9	10	11	12	13	14
			4	6	8	10	11	12	13	14	15
				5	7	9	11	13	14	15	16
					6	8	10	12	14	16	17
						7	9	11	13	15	17
							8	10	12	14	16
								9	11	13	15
									10	12	14
										11	13
											12