A257857 - OEIS

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A257857 as a triangular array

													2
												1		1
											0		2		0
										1		1		1		1
									2		0		2		0		2
								1		1		1		1		1		1
							0		2		0		2		0		2		0
						1		1		1		1		1		1		1		1
					2		0		2		0		2		0		2		0		2
				1		1		1		1		1		1		1		1		1		1
			0		2		0		2		0		2		0		2		0		2		0
		1		1		1		1		1		1		1		1		1		1		1		1
	2		0		2		0		2

A257857 as a square array

2	1	0	1	2	1	0	1	2	1	0	1	2
1	2	1	0	1	2	1	0	1	2	1	0
0	1	2	1	0	1	2	1	0	1	2
1	0	1	2	1	0	1	2	1	0
2	1	0	1	2	1	0	1	2
1	2	1	0	1	2	1
0	1	2	1	0	1
1	0	1	2	1
2	1	0	1
1	2	1
0	1
1

A257857 as an upper right triangle

2	1	0	1	2	1	0	1	2	1	0	1	2
	1	2	1	0	1	2	1	0	1	2	1	0
		0	1	2	1	0	1	2	1	0	1	2
			1	0	1	2	1	0	1	2	1	0
				2	1	0	1	2	1	0	1	2
					1	2	1	0	1	2	1
						0	1	2	1	0	1
							1	0	1	2	1
								2	1	0	1
									1	2	1
										0	1
											1