A198906 - OEIS

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A198906 as a triangular array

								1
							1		1
						2		4		2
					5		33		33		5
				15		380		1211		380		15
			51		4801		50384		50384		4801		51
		187		62004		2125425		6907736		2125425		62004		187
	715		804833		89793204		948656912		948656912		89793204		804833		715
2795		10459180		3794115705

A198906 as a square array

1	1	2	5	15	51	187	715	2795
1	4	33	380	4801	62004	804833	10459180
2	33	1211	50384	2125425	89793204	3794115705
5	380	50384	6907736	948656912
15	4801	2125425	948656912
51	62004	89793204
187	804833
715

A198906 as an upper right triangle

1	1	2	5	15	51	187	715	2795
	1	4	33	380	4801	62004	804833	10459180
		2	33	1211	50384	2125425	89793204	3794115705
			5	380	50384	6907736	948656912
				15	4801	2125425	948656912
					51	62004	89793204
						187	804833
							715