A127831 - OEIS

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A127831 as a triangular array

											1
										0		1
									0		0		1
								0		0		-1		1
							0		0		1		-1		1
						0		0		0		0		0		1
					0		0		-1		1		-1		0		1
				0		0		1		-1		1		-1		-1		1
			0		0		0		0		0		1		0		-1		1
		0		0		0		0		0		1		0		-1		0		1
	0		0		-1		1		-1		1		1		-1		0		0		1

A127831 as a square array

1	0	0	0	0	0	0	0	0	0	0
1	0	0	0	0	0	0	0	0	0
1	-1	1	0	-1	1	0	0	-1
1	-1	0	1	-1	0	0	1
1	0	-1	1	0	0	-1
1	0	-1	1	1	1
1	-1	0	0	1
1	-1	-1	-1
1	0	0
1	0
1

A127831 as an upper right triangle

1	0	0	0	0	0	0	0	0	0	0
	1	0	0	0	0	0	0	0	0	0
		1	-1	1	0	-1	1	0	0	-1
			1	-1	0	1	-1	0	0	1
				1	0	-1	1	0	0	-1
					1	0	-1	1	1	1
						1	-1	0	0	1
							1	-1	-1	-1
								1	0	0
									1	0
										1