A259857 - OEIS

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A259857 as a triangular array

												1
											0		2
										0		0		6
									0		0		1		18
								0		0		0		8		55
							0		0		0		2		40		174
						0		0		0		0		22		168		566
					0		0		0		0		6		134		676		1868
				0		0		0		0		1		72		656		2672		6237
			0		0		0		0		0		30		482		2992		10376		21050
		0		0		0		0		0		8		310		2592		13160		39824		71666
	0		0		0		0		0		2		151		2086		12862		56162		151878		245696

A259857 as a square array

1	0	0	0	0	0	0	0	0	0	0	0
2	0	0	0	0	0	0	0	0	0	0
6	1	0	0	0	0	0	0	0	0
18	8	2	0	0	0	0	0	0
55	40	22	6	1	0	0	0
174	168	134	72	30	8	2
566	676	656	482	310	151
1868	2672	2992	2592	2086
6237	10376	13160	12862
21050	39824	56162
71666	151878
245696

A259857 as an upper right triangle

1	0	0	0	0	0	0	0	0	0	0	0
	2	0	0	0	0	0	0	0	0	0	0
		6	1	0	0	0	0	0	0	0	0
			18	8	2	0	0	0	0	0	0
				55	40	22	6	1	0	0	0
					174	168	134	72	30	8	2
						566	676	656	482	310	151
							1868	2672	2992	2592	2086
								6237	10376	13160	12862
									21050	39824	56162
										71666	151878
											245696