A131227 - OEIS

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A131227 as a triangular array

										1
									2		3
								1		2		5
							2		1		2		7
						1		2		1		2		9
					2		1		2		1		2		11
				1		2		1		2		1		2		13
			2		1		2		1		2		1		2		15
		1		2		1		2		1		2		1		2		17
	2		1		2		1		2		1		2		1		2		19

A131227 as a square array

1	2	1	2	1	2	1	2	1	2
3	2	1	2	1	2	1	2	1
5	2	1	2	1	2	1	2
7	2	1	2	1	2	1
9	2	1	2	1	2
11	2	1	2	1
13	2	1	2
15	2	1
17	2
19

A131227 as an upper right triangle

1	2	1	2	1	2	1	2	1	2
	3	2	1	2	1	2	1	2	1
		5	2	1	2	1	2	1	2
			7	2	1	2	1	2	1
				9	2	1	2	1	2
					11	2	1	2	1
						13	2	1	2
							15	2	1
								17	2
									19