A207868 - OEIS

The OEIS is supported by the many generous donors to the OEIS Foundation.

A207868 as a triangular array

								1
							1		1
						2		4		2
					5		34		34		5
				15		500		2052		500		15
			52		10900		278982		278982		10900		52
		203		322768		68162042		455546040		68162042		322768		203
	877		12297768		26419793726		1625686993918		1625686993918		26419793726		12297768		877

A207868 as a square array

1	1	2	5	15	52	203	877
1	4	34	500	10900	322768	12297768
2	34	2052	278982	68162042	26419793726
5	500	278982	455546040	1625686993918
15	10900	68162042	1625686993918
52	322768	26419793726
203	12297768
877

A207868 as an upper right triangle

1	1	2	5	15	52	203	877
	1	4	34	500	10900	322768	12297768
		2	34	2052	278982	68162042	26419793726
			5	500	278982	455546040	1625686993918
				15	10900	68162042	1625686993918
					52	322768	26419793726
						203	12297768
							877