A213921 - OEIS

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A213921 as a triangular array

											1
										2		3
									5		4		7
								10		8		9		13
							17		14		6		16		21
						26		22		11		12		25		31
					37		32		18		15		20		36		43
				50		44		27		23		24		30		49		57
			65		58		38		33		19		35		42		64		73
		82		74		51		45		28		29		48		56		81		91
	101		92		66		59		39		34		41		63		72		100		111

A213921 as a square array

1	2	5	10	17	26	37	50	65	82	101
3	4	8	14	22	32	44	58	74	92
7	9	6	11	18	27	38	51	66
13	16	12	15	23	33	45	59
21	25	20	24	19	28	39
31	36	30	35	29	34
43	49	42	48	41
57	64	56	63
73	81	72
91	100
111

A213921 as an upper right triangle

1	2	5	10	17	26	37	50	65	82	101
	3	4	8	14	22	32	44	58	74	92
		7	9	6	11	18	27	38	51	66
			13	16	12	15	23	33	45	59
				21	25	20	24	19	28	39
					31	36	30	35	29	34
						43	49	42	48	41
							57	64	56	63
								73	81	72
									91	100
										111