A115951 - OEIS

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A115951 as a triangular array

											1
										0		2
									0		2		6
								0		0		12		20
							0		0		6		60		70
						0		0		0		60		280		252
					0		0		0		20		420		1260		924
				0		0		0		0		280		2520		5544		3432
			0		0		0		0		70		2520		13860		24024		12870
		0		0		0		0		0		1260		18480		72072		102960		48620
	0		0		0		0		0		252		13860		120120		360360		437580		184756

A115951 as a square array

1	0	0	0	0	0	0	0	0	0	0
2	2	0	0	0	0	0	0	0	0
6	12	6	0	0	0	0	0	0
20	60	60	20	0	0	0	0
70	280	420	280	70	0	0
252	1260	2520	2520	1260	252
924	5544	13860	18480	13860
3432	24024	72072	120120
12870	102960	360360
48620	437580
184756

A115951 as an upper right triangle

1	0	0	0	0	0	0	0	0	0	0
	2	2	0	0	0	0	0	0	0	0
		6	12	6	0	0	0	0	0	0
			20	60	60	20	0	0	0	0
				70	280	420	280	70	0	0
					252	1260	2520	2520	1260	252
						924	5544	13860	18480	13860
							3432	24024	72072	120120
								12870	102960	360360
									48620	437580
										184756