A131966 - OEIS

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A131966 as a triangular array

												1
											2		3
										4		6		5
									7		9		8		10
								11		14		13		15		12
							16		19		18		21		17		20
						22		26		24		28		23		27		25
					29		33		31		35		30		34		32		36
				37		42		40		44		39		43		41		45		38
			46		51		49		54		48		53		50		55		47		52
		56		62		59		65		58		64		61		66		57		63		60
	67		73		70		76		69		75		72		78		68		74		71		77

A131966 as a square array

1	2	4	7	11	16	22	29	37	46	56	67
3	6	9	14	19	26	33	42	51	62	73
5	8	13	18	24	31	40	49	59	70
10	15	21	28	35	44	54	65	76
12	17	23	30	39	48	58	69
20	27	34	43	53	64	75
25	32	41	50	61	72
36	45	55	66	78
38	47	57	68
52	63	74
60	71
77

A131966 as an upper right triangle

1	2	4	7	11	16	22	29	37	46	56	67
	3	6	9	14	19	26	33	42	51	62	73
		5	8	13	18	24	31	40	49	59	70
			10	15	21	28	35	44	54	65	76
				12	17	23	30	39	48	58	69
					20	27	34	43	53	64	75
						25	32	41	50	61	72
							36	45	55	66	78
								38	47	57	68
									52	63	74
										60	71
											77