A209491 - OEIS

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A209491 as a triangular array

											1
										3		0
									8		0		0
								20		4		0		0
							47		15		0		0		0
						107		37		0		0		0		0
					238		87		16		0		0		0		0
				520		200		60		0		0		0		0		0
			1121		448		169		0		0		0		0		0		0
		2391		992		387		64		0		0		0		0		0		0
	5056		2160		865		240		0		0		0		0		0		0		0

A209491 as a square array

1	3	8	20	47	107	238	520	1121	2391	5056
0	0	4	15	37	87	200	448	992	2160
0	0	0	0	16	60	169	387	865
0	0	0	0	0	0	64	240
0	0	0	0	0	0	0
0	0	0	0	0	0
0	0	0	0	0
0	0	0	0
0	0	0
0	0
0

A209491 as an upper right triangle

1	3	8	20	47	107	238	520	1121	2391	5056
	0	0	4	15	37	87	200	448	992	2160
		0	0	0	0	16	60	169	387	865
			0	0	0	0	0	0	64	240
				0	0	0	0	0	0	0
					0	0	0	0	0	0
						0	0	0	0	0
							0	0	0	0
								0	0	0
									0	0
										0