A190909 - OEIS

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A190909 as a triangular array

										1
									1		1
								1		3		2
							1		6		10		6
						1		10		30		42		6
					1		15		70		168		54		30
				1		21		140		504		270		330		20
			1		28		252		1260		990		1980		260		140
		1		36		420		2772		2970		8580		1820		2100		70
	1		45		660		5544		7722		30030		9100		16800		1190		630

A190909 as a square array

1	1	1	1	1	1	1	1	1	1
1	3	6	10	15	21	28	36	45
2	10	30	70	140	252	420	660
6	42	168	504	1260	2772	5544
6	54	270	990	2970	7722
30	330	1980	8580	30030
20	260	1820	9100
140	2100	16800
70	1190
630

A190909 as an upper right triangle

1	1	1	1	1	1	1	1	1	1
	1	3	6	10	15	21	28	36	45
		2	10	30	70	140	252	420	660
			6	42	168	504	1260	2772	5544
				6	54	270	990	2970	7722
					30	330	1980	8580	30030
						20	260	1820	9100
							140	2100	16800
								70	1190
									630