A104000 - OEIS

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A104000 as a triangular array

										2
									4		2
								6		12		2
							8		30		28		2
						10		56		126		84		2
					12		90		344		630		244		2
				14		132		730		2408		3126		732		2
			16		182		1332		6570		16808		15630		2188		2
		18		240		2198		14652		59050		117656		78126		6564		2
	20		306		3376		28574		161052		531450

A104000 as a square array

2	4	6	8	10	12	14	16	18	20
2	12	30	56	90	132	182	240	306
2	28	126	344	730	1332	2198	3376
2	84	630	2408	6570	14652	28574
2	244	3126	16808	59050	161052
2	732	15630	117656	531450
2	2188	78126
2	6564
2

A104000 as an upper right triangle

2	4	6	8	10	12	14	16	18	20
	2	12	30	56	90	132	182	240	306
		2	28	126	344	730	1332	2198	3376
			2	84	630	2408	6570	14652	28574
				2	244	3126	16808	59050	161052
					2	732	15630	117656	531450
						2	2188	78126
							2	6564
								2