A213927 - OEIS

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A213927 as a triangular array

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

A213927 as a square array

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

A213927 as an upper right triangle

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