A110769 - OEIS

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A110769 as a triangular array

											1
										3		3
									6		9		6
								10		17		18		10
							15		27		33		30		15
						21		39		51		54		45		21
					28		53		72		82		80		63		28
				36		69		96		114		120		111		84		36
			45		87		123		150		165		165		147		108		45
		55		107		153		190		215		225		217		188		135		55
	66		129		186		234		270		291		294		276

A110769 as a square array

1	3	6	10	15	21	28	36	45	55	66
3	9	17	27	39	53	69	87	107	129
6	18	33	51	72	96	123	153	186
10	30	54	82	114	150	190	234
15	45	80	120	165	215	270
21	63	111	165	225	291
28	84	147	217	294
36	108	188	276
45	135
55

A110769 as an upper right triangle

1	3	6	10	15	21	28	36	45	55	66
	3	9	17	27	39	53	69	87	107	129
		6	18	33	51	72	96	123	153	186
			10	30	54	82	114	150	190	234
				15	45	80	120	165	215	270
					21	63	111	165	225	291
						28	84	147	217	294
							36	108	188	276
								45	135
									55