A001477 - OEIS

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A001477 as a triangular array

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

A001477 as a square array

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

A001477 as an upper right triangle

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