A131406 - OEIS

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A131406 as a triangular array

									1
								2		1
							1		2		1
						2		1		2		1
					1		2		1		2		1
				2		1		2		1		2		1
			1		2		1		2		1		2		1
		2		1		2		1		2		1		2		1
	1		2		1		2		1		2		1		2		1
2		1		2		1		2		1		2		1		2		1

A131406 as a square array

1	2	1	2	1	2	1	2	1	2
1	2	1	2	1	2	1	2	1
1	2	1	2	1	2	1	2
1	2	1	2	1	2	1
1	2	1	2	1	2
1	2	1	2	1
1	2	1	2
1	2	1
1	2
1

A131406 as an upper right triangle

1	2	1	2	1	2	1	2	1	2
	1	2	1	2	1	2	1	2	1
		1	2	1	2	1	2	1	2
			1	2	1	2	1	2	1
				1	2	1	2	1	2
					1	2	1	2	1
						1	2	1	2
							1	2	1
								1	2
									1