A212431 - OEIS

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A212431 as a triangular array

1

1 1

2 1 2

5 3 2 5

15 9 8 5 15

52 31 28 25 15 52

203 121 108 100 90 52 203

877 523 466 425 405 364 203 877

4140 2469 2202 2000 1875 1820 1624 877 4140

21147 12611 11250 10230 9525 9100 8932 7893 4140 21147

A212431 as a square array

`1`	`1`	`2`	`5`	`15`	`52`	`203`	`877`	`4140`	`21147`
`1`	`1`	`3`	`9`	`31`	`121`	`523`	`2469`	`12611`
`2`	`2`	`8`	`28`	`108`	`466`	`2202`	`11250`
`5`	`5`	`25`	`100`	`425`	`2000`	`10230`
`15`	`15`	`90`	`405`	`1875`	`9525`
`52`	`52`	`364`	`1820`	`9100`
`203`	`203`	`1624`	`8932`
`877`	`877`	`7893`
`4140`	`4140`
`21147`

A212431 as an upper right triangle

`1`	`1`	`2`	`5`	`15`	`52`	`203`	`877`	`4140`	`21147`
	`1`	`1`	`3`	`9`	`31`	`121`	`523`	`2469`	`12611`
		`2`	`2`	`8`	`28`	`108`	`466`	`2202`	`11250`
			`5`	`5`	`25`	`100`	`425`	`2000`	`10230`
				`15`	`15`	`90`	`405`	`1875`	`9525`
					`52`	`52`	`364`	`1820`	`9100`
						`203`	`203`	`1624`	`8932`
							`877`	`877`	`7893`
								`4140`	`4140`
									`21147`

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Last modified May 21 14:18 EDT 2024. Contains 372738 sequences. (Running on oeis4.)