A217234 - OEIS

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A217234 as a triangular array

										1
									1		4
								1		12		6
							1		40		20		8
						1		140		70		30		10
					1		504		252		112		42		12
				1		1848		924		420		168		56		14
			1		6864		3432		1584		660		240		72		16
		1		25740		12870		6006		2574		990		330		90		18
	1		97240		48620		22880		10010		4004		1430		440		110		20

A217234 as a square array

1	1	1	1	1	1	1	1	1	1
4	12	40	140	504	1848	6864	25740	97240
6	20	70	252	924	3432	12870	48620
8	30	112	420	1584	6006	22880
10	42	168	660	2574	10010
12	56	240	990	4004
14	72	330	1430
16	90	440
18	110
20

A217234 as an upper right triangle

1	1	1	1	1	1	1	1	1	1
	4	12	40	140	504	1848	6864	25740	97240
		6	20	70	252	924	3432	12870	48620
			8	30	112	420	1584	6006	22880
				10	42	168	660	2574	10010
					12	56	240	990	4004
						14	72	330	1430
							16	90	440
								18	110
									20