A075348 - OEIS

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A075348 as a triangular array

												2
											1		4
										3		5		9
									6		7		8		10
								11		12		13		14		17
							15		16		18		19		20		21
						22		23		24		25		26		27		32
					28		29		30		31		33		34		35		37
				36		38		39		40		41		42		43		44		50
			45		46		47		48		49		51		52		53		54		58
		55		56		57		59		60		61		62		63		64		65		71
	66		67		68		69		70		72

A075348 as a square array

2	1	3	6	11	15	22	28	36	45	55	66
4	5	7	12	16	23	29	38	46	56	67
9	8	13	18	24	30	39	47	57	68
10	14	19	25	31	40	48	59	69
17	20	26	33	41	49	60	70
21	27	34	42	51	61	72
32	35	43	52	62
37	44	53	63
50	54	64
58	65
71

A075348 as an upper right triangle

2	1	3	6	11	15	22	28	36	45	55	66
	4	5	7	12	16	23	29	38	46	56	67
		9	8	13	18	24	30	39	47	57	68
			10	14	19	25	31	40	48	59	69
				17	20	26	33	41	49	60	70
					21	27	34	42	51	61	72
						32	35	43	52	62
							37	44	53	63
								50	54	64
									58	65
										71