A221971 - OEIS

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

A221971 as a triangular array

												1
											0		1
										0		1		1
									0		0		4		1
								0		0		3		11		1
							0		0		0		27		26		1
						0		0		0		17		148		57		1
					0		0		0		0		278		646		120		1
				0		0		0		0		155		2590		2481		247		1
			0		0		0		0		0		4073		18304		8805		502		1
		0		0		0		0		0		2073		58427		109699		29682		1013		1
	0		0		0

A221971 as a square array

1	0	0	0	0	0	0	0	0	0	0	0
1	1	0	0	0	0	0	0	0	0	0
1	4	3	0	0	0	0	0	0	0
1	11	27	17	0	0	0	0
1	26	148	278	155	0	0
1	57	646	2590	4073	2073
1	120	2481	18304	58427
1	247	8805	109699
1	502	29682
1	1013
1

A221971 as an upper right triangle

1	0	0	0	0	0	0	0	0	0	0	0
	1	1	0	0	0	0	0	0	0	0	0
		1	4	3	0	0	0	0	0	0	0
			1	11	27	17	0	0	0	0
				1	26	148	278	155	0	0
					1	57	646	2590	4073	2073
						1	120	2481	18304	58427
							1	247	8805	109699
								1	502	29682
									1	1013
										1