A216031 - OEIS

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A216031 as a triangular array

1

1 1

1 2 1

1 2 2 1

1 5 4 5 1

2 12 29 29 12 2

2 42 97 371 97 42 2

5 136 1534 6150 6150 1534 136 5

5 602 7050 167130 146327 167130 7050 602 5

15 2440 188835 5219070 30312074 30312074 5219070 188835 2440 15

15 12840

A216031 as a square array

`1`	`1`	`1`	`1`	`1`	`2`	`2`	`5`	`5`	`15`	`15`
`1`	`2`	`2`	`5`	`12`	`42`	`136`	`602`	`2440`	`12840`
`1`	`2`	`4`	`29`	`97`	`1534`	`7050`	`188835`
`1`	`5`	`29`	`371`	`6150`	`167130`	`5219070`
`1`	`12`	`97`	`6150`	`146327`	`30312074`
`2`	`42`	`1534`	`167130`	`30312074`
`2`	`136`	`7050`	`5219070`
`5`	`602`	`188835`
`5`	`2440`
`15`

A216031 as an upper right triangle

`1`	`1`	`1`	`1`	`1`	`2`	`2`	`5`	`5`	`15`	`15`
	`1`	`2`	`2`	`5`	`12`	`42`	`136`	`602`	`2440`	`12840`
		`1`	`2`	`4`	`29`	`97`	`1534`	`7050`	`188835`
			`1`	`5`	`29`	`371`	`6150`	`167130`	`5219070`
				`1`	`12`	`97`	`6150`	`146327`	`30312074`
					`2`	`42`	`1534`	`167130`	`30312074`
						`2`	`136`	`7050`	`5219070`
							`5`	`602`	`188835`
								`5`	`2440`
									`15`

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Last modified April 25 11:03 EDT 2024. Contains 371967 sequences. (Running on oeis4.)