A104712 - OEIS

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A104712 as a triangular array

												1
											3		1
										6		4		1
									10		10		5		1
								15		20		15		6		1
							21		35		35		21		7		1
						28		56		70		56		28		8		1
					36		84		126		126		84		36		9		1
				45		120		210		252		210		120		45		10		1
			55		165		330		462		462		330		165		55		11		1
		66		220		495		792		924		792		495		220		66		12		1
	78		286		715

A104712 as a square array

1	3	6	10	15	21	28	36	45	55	66	78
1	4	10	20	35	56	84	120	165	220	286
1	5	15	35	70	126	210	330	495	715
1	6	21	56	126	252	462	792
1	7	28	84	210	462	924
1	8	36	120	330	792
1	9	45	165	495
1	10	55	220
1	11	66
1	12
1

A104712 as an upper right triangle

1	3	6	10	15	21	28	36	45	55	66	78
	1	4	10	20	35	56	84	120	165	220	286
		1	5	15	35	70	126	210	330	495	715
			1	6	21	56	126	252	462	792
				1	7	28	84	210	462	924
					1	8	36	120	330	792
						1	9	45	165	495
							1	10	55	220
								1	11	66
									1	12
										1