A047918 - OEIS

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A047918 as a triangular array

												1
											2		0
										6		0		0
									8		0		0		16
								20		0		0		0		100
							12		24		36		0		0		648
						42		0		0		0		0		0		4998
					32		32		0		320		0		0		0		39936
				54		0		270		0		0		0		0		0		362556
			40		160		0		0		3800		0		0		0		0		3624800
		110		0		0		0		0		0		0		0		0		0		39916690
	48		96

A047918 as a square array

1	2	6	8	20	12	42	32	54	40	110	48
0	0	0	0	24	0	32	0	160	0	96
0	0	0	36	0	0	270	0	0
16	0	0	0	320	0	0	0
100	0	0	0	0	3800	0
648	0	0	0	0	0
4998	0	0	0	0
39936	0	0	0
362556	0	0
3624800	0
39916690

A047918 as an upper right triangle

1	2	6	8	20	12	42	32	54	40	110	48
	0	0	0	0	24	0	32	0	160	0	96
		0	0	0	36	0	0	270	0	0
			16	0	0	0	320	0	0	0
				100	0	0	0	0	3800	0
					648	0	0	0	0	0
						4998	0	0	0	0
							39936	0	0	0
								362556	0	0
									3624800	0
										39916690