A066182 - OEIS

The OEIS is supported by the many generous donors to the OEIS Foundation.

A066182 as a triangular array

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

A066182 as a square array

1	3	6	10	15	21	28	36	45	55	66	78
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
35	43	52	62
44	53	63
54	64
65

A066182 as an upper right triangle

1	3	6	10	15	21	28	36	45	55	66	78
	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
							35	43	52	62
								44	53	63
									54	64
										65