A348684 - OEIS

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A348684 as a triangular array

											0
										2		1
									4		3		3
								6		5		5		4
							8		7		7		6		7
						10		9		9		8		9		8
					12		11		11		10		11		10		10
				14		13		13		12		13		12		12		11
			16		15		15		14		15		14		14		13		15
		18		17		17		16		17		16		16		15		17		16
	20		19		19		18		19		18		18		17		19		18		18

A348684 as a square array

0	2	4	6	8	10	12	14	16	18	20
1	3	5	7	9	11	13	15	17	19
3	5	7	9	11	13	15	17	19
4	6	8	10	12	14	16	18
7	9	11	13	15	17	19
8	10	12	14	16	18
10	12	14	16	18
11	13	15	17
15	17	19
16	18
18

A348684 as an upper right triangle

0	2	4	6	8	10	12	14	16	18	20
	1	3	5	7	9	11	13	15	17	19
		3	5	7	9	11	13	15	17	19
			4	6	8	10	12	14	16	18
				7	9	11	13	15	17	19
					8	10	12	14	16	18
						10	12	14	16	18
							11	13	15	17
								15	17	19
									16	18
										18