A340556 - OEIS

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A340556 as a triangular array

										1
									0		1
								0		1		2
							0		1		8		6
						0		1		22		58		24
					0		1		52		328		444		120
				0		1		114		1452		4400		3708		720
			0		1		240		5610		32120		58140		33984		5040
		0		1		494		19950		195800		644020		785304		341136		40320
	0		1		1004		67260		1062500		5765500		12440064		11026296		3733920		362880

A340556 as a square array

1	0	0	0	0	0	0	0	0	0
1	1	1	1	1	1	1	1	1
2	8	22	52	114	240	494	1004
6	58	328	1452	5610	19950	67260
24	444	4400	32120	195800	1062500
120	3708	58140	644020	5765500
720	33984	785304	12440064
5040	341136	11026296
40320	3733920
362880

A340556 as an upper right triangle

1	0	0	0	0	0	0	0	0	0
	1	1	1	1	1	1	1	1	1
		2	8	22	52	114	240	494	1004
			6	58	328	1452	5610	19950	67260
				24	444	4400	32120	195800	1062500
					120	3708	58140	644020	5765500
						720	33984	785304	12440064
							5040	341136	11026296
								40320	3733920
									362880