A180997 - OEIS

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A180997 as a triangular array

														2
													1		1
												0		2		0
											0		1		1		0
										0		0		3		0		0
									0		0		2		2		0		0
								0		0		0		7		0		0		0
							0		0		0		5		5		0		0		0
						0		0		0		0		26		0		0		0		0
					0		0		0		0		21		21		0		0		0		0
				0		0		0		0		0		145		0		0		0		0		0
			0		0		0		0		0		124		124		0		0		0		0		0
		0		0		0		0		0		0		1269		0		0		0		0		0		0
	0		0		0		0		0		0		1145

A180997 as a square array

2	1	0	0	0	0	0	0	0	0	0	0	0	0
1	2	1	0	0	0	0	0	0	0	0	0	0
0	1	3	2	0	0	0	0	0	0	0	0
0	0	2	7	5	0	0	0	0	0	0
0	0	0	5	26	21	0	0	0	0
0	0	0	0	21	145	124	0	0
0	0	0	0	0	124	1269	1145
0	0	0	0	0	0
0	0	0	0	0
0	0	0	0
0	0	0
0	0
0

A180997 as an upper right triangle

2	1	0	0	0	0	0	0	0	0	0	0	0	0
	1	2	1	0	0	0	0	0	0	0	0	0	0
		0	1	3	2	0	0	0	0	0	0	0	0
			0	0	2	7	5	0	0	0	0	0	0
				0	0	0	5	26	21	0	0	0	0
					0	0	0	0	21	145	124	0	0
						0	0	0	0	0	124	1269	1145
							0	0	0	0	0	0
								0	0	0	0	0
									0	0	0	0
										0	0	0
											0	0
												0