A191671 - OEIS

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A191671 as a triangular array

											1
										2		5
									3		7		9
								4		10		12		13
							6		14		16		18		17
						8		19		22		24		23		21
					11		26		30		32		31		28		25
				15		35		40		43		42		38		34		29
			20		47		54		58		56		51		46		39		33
		27		63		72		78		75		68		62		52		44		37
	36		84		96		104		100		91		83		70		59		50		41

A191671 as a square array

1	2	3	4	6	8	11	15	20	27	36
5	7	10	14	19	26	35	47	63	84
9	12	16	22	30	40	54	72	96
13	18	24	32	43	58	78	104
17	23	31	42	56	75	100
21	28	38	51	68	91
25	34	46	62	83
29	39	52	70
33	44	59
37	50
41

A191671 as an upper right triangle

1	2	3	4	6	8	11	15	20	27	36
	5	7	10	14	19	26	35	47	63	84
		9	12	16	22	30	40	54	72	96
			13	18	24	32	43	58	78	104
				17	23	31	42	56	75	100
					21	28	38	51	68	91
						25	34	46	62	83
							29	39	52	70
								33	44	59
									37	50
										41