A140818 - OEIS

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A140818 as a triangular array

										1
									2		2
								2		2		2
							2		6		6		2
						2		8		6		8		2
					2		10		20		20		10		2
				2		12		30		20		30		12		2
			2		14		42		70		70		42		14		2
		2		16		56		112		70		112		56		16		2
	2		18		72		168		252		252		168		72		18		2

A140818 as a square array

1	2	2	2	2	2	2	2	2	2
2	2	6	8	10	12	14	16	18
2	6	6	20	30	42	56	72
2	8	20	20	70	112	168
2	10	30	70	70	252
2	12	42	112	252
2	14	56	168
2	16	72
2	18
2

A140818 as an upper right triangle

1	2	2	2	2	2	2	2	2	2
	2	2	6	8	10	12	14	16	18
		2	6	6	20	30	42	56	72
			2	8	20	20	70	112	168
				2	10	30	70	70	252
					2	12	42	112	252
						2	14	56	168
							2	16	72
								2	18
									2