A049403 - OEIS

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A049403 as a triangular array

												1
											1		1
										0		3		1
									0		3		6		1
								0		0		15		10		1
							0		0		15		45		15		1
						0		0		0		105		105		21		1
					0		0		0		105		420		210		28		1
				0		0		0		0		945		1260		378		36		1
			0		0		0		0		945		4725		3150		630		45		1
		0		0		0		0		0		10395		17325		6930		990		55		1
	0		0		0		0		0		10395		62370

A049403 as a square array

1	1	0	0	0	0	0	0	0	0	0	0
1	3	3	0	0	0	0	0	0	0	0
1	6	15	15	0	0	0	0	0	0
1	10	45	105	105	0	0	0	0
1	15	105	420	945	945	0	0
1	21	210	1260	4725	10395	10395
1	28	378	3150	17325	62370
1	36	630	6930
1	45	990
1	55
1

A049403 as an upper right triangle

1	1	0	0	0	0	0	0	0	0	0	0
	1	3	3	0	0	0	0	0	0	0	0
		1	6	15	15	0	0	0	0	0	0
			1	10	45	105	105	0	0	0	0
				1	15	105	420	945	945	0	0
					1	21	210	1260	4725	10395	10395
						1	28	378	3150	17325	62370
							1	36	630	6930
								1	45	990
									1	55
										1