A127893 - OEIS

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A127893 as a triangular array

										1
									3		1
								6		6		1
							10		21		9		1
						15		56		45		12		1
					21		126		165		78		15		1
				28		252		495		364		120		18		1
			36		462		1287		1365		680		171		21		1
		45		792		3003		4368		3060		1140		231		24		1
	55		1287		6435		12376		11628		5985		1771		300		27		1

A127893 as a square array

1	3	6	10	15	21	28	36	45	55
1	6	21	56	126	252	462	792	1287
1	9	45	165	495	1287	3003	6435
1	12	78	364	1365	4368	12376
1	15	120	680	3060	11628
1	18	171	1140	5985
1	21	231	1771
1	24	300
1	27
1

A127893 as an upper right triangle

1	3	6	10	15	21	28	36	45	55
	1	6	21	56	126	252	462	792	1287
		1	9	45	165	495	1287	3003	6435
			1	12	78	364	1365	4368	12376
				1	15	120	680	3060	11628
					1	18	171	1140	5985
						1	21	231	1771
							1	24	300
								1	27
									1