A375779 - OEIS

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A375779 as a triangular array

												0
											2		1
										4		3		5
									7		8		6		9
								12		13		11		14		10
							18		17		19		16		20		15
						24		23		25		22		26		21		27
					31		32		30		33		29		34		28		35
				40		41		39		42		38		43		37		44		36
			50		49		51		48		52		47		53		46		54		45
		60		59		61		58		62		57		63		56		64		55		65
	71		72		70		73		69		74		68		75		67		76		66		77

A375779 as a square array

0	2	4	7	12	18	24	31	40	50	60	71
1	3	8	13	17	23	32	41	49	59	72
5	6	11	19	25	30	39	51	61	70
9	14	16	22	33	42	48	58	73
10	20	26	29	38	52	62	69
15	21	34	43	47	57	74
27	28	37	53	63	68
35	44	46	56	75
36	54	64	67
45	55	76
65	66
77

A375779 as an upper right triangle

0	2	4	7	12	18	24	31	40	50	60	71
	1	3	8	13	17	23	32	41	49	59	72
		5	6	11	19	25	30	39	51	61	70
			9	14	16	22	33	42	48	58	73
				10	20	26	29	38	52	62	69
					15	21	34	43	47	57	74
						27	28	37	53	63	68
							35	44	46	56	75
								36	54	64	67
									45	55	76
										65	66
											77