A219875 - OEIS

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A219875 as a triangular array

											2
										4		4
									5		8		5
								7		10		10		7
							9		14		13		14		9
						10		18		18		18		18		10
					12		20		23		25		23		20		12
				13		24		26		32		32		26		24		13
			15		26		31		36		41		36		31		26		15
		17		30		34		43		46		46		43		34		30		17
	18		34		39		47		55		52		55		47		39		34		18

A219875 as a square array

2	4	5	7	9	10	12	13	15	17	18
4	8	10	14	18	20	24	26	30	34
5	10	13	18	23	26	31	34	39
7	14	18	25	32	36	43	47
9	18	23	32	41	46	55
10	20	26	36	46	52
12	24	31	43	55
13	26	34	47
15	30	39
17	34
18

A219875 as an upper right triangle

2	4	5	7	9	10	12	13	15	17	18
	4	8	10	14	18	20	24	26	30	34
		5	10	13	18	23	26	31	34	39
			7	14	18	25	32	36	43	47
				9	18	23	32	41	46	55
					10	20	26	36	46	52
						12	24	31	43	55
							13	26	34	47
								15	30	39
									17	34
										18