A048225 - OEIS

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A048225 as a triangular array

											3
										1		4
									2		3		6
								5		7		8		11
							9		14		16		17		20
						10		19		24		26		27		30
					12		22		31		36		38		39		42
				13		25		35		44		49		51		52		55
			15		28		40		50		59		64		66		67		70
		18		33		46		58		68		77		82		84		85		88
	21		39		54		67		79		89		98		103		105

A048225 as a square array

3	1	2	5	9	10	12	13	15	18	21
4	3	7	14	19	22	25	28	33	39
6	8	16	24	31	35	40	46	54
11	17	26	36	44	50	58	67
20	27	38	49	59	68	79
30	39	51	64	77	89
42	52	66	82	98
55	67	84	103
70	85	105
88

A048225 as an upper right triangle

3	1	2	5	9	10	12	13	15	18	21
	4	3	7	14	19	22	25	28	33	39
		6	8	16	24	31	35	40	46	54
			11	17	26	36	44	50	58	67
				20	27	38	49	59	68	79
					30	39	51	64	77	89
						42	52	66	82	98
							55	67	84	103
								70	85	105
									88