A355881 - OEIS

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A355881 as a triangular array

									1
								1		2
							1		9		3
						1		41		49		4
					1		187		801		169		5
				1		853		13095		7141		441		6
			1		3891		214083		301741		38897		961		7
		1		17749		3499929		12749989		3430789		153921		1849		8
	1		80963		57218481		538747549		302602093		24653151		488401		3249		9

A355881 as a square array

1	1	1	1	1	1	1	1	1
2	9	41	187	853	3891	17749	80963
3	49	801	13095	214083	3499929	57218481
4	169	7141	301741	12749989	538747549
5	441	38897	3430789	302602093
6	961	153921	24653151
7	1849	488401
8	3249
9

A355881 as an upper right triangle

1	1	1	1	1	1	1	1	1
	2	9	41	187	853	3891	17749	80963
		3	49	801	13095	214083	3499929	57218481
			4	169	7141	301741	12749989	538747549
				5	441	38897	3430789	302602093
					6	961	153921	24653151
						7	1849	488401
							8	3249
								9