A213947 - OEIS

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A213947 as a triangular array

1

1 2

1 4 3

1 10 6 4

1 20 21 8 5

1 42 57 28 10 6

1 84 150 88 35 12 7

1 170 390 252 110 42 14 8

1 340 990 712 335 132 49 16 9

1 682 2475 1992 975 402 154 56 18 10

A213947 as a square array

`1`	`1`	`1`	`1`	`1`	`1`	`1`	`1`	`1`	`1`
`2`	`4`	`10`	`20`	`42`	`84`	`170`	`340`	`682`
`3`	`6`	`21`	`57`	`150`	`390`	`990`	`2475`
`4`	`8`	`28`	`88`	`252`	`712`	`1992`
`5`	`10`	`35`	`110`	`335`	`975`
`6`	`12`	`42`	`132`	`402`
`7`	`14`	`49`	`154`
`8`	`16`	`56`
`9`	`18`
`10`

A213947 as an upper right triangle

`1`	`1`	`1`	`1`	`1`	`1`	`1`	`1`	`1`	`1`
	`2`	`4`	`10`	`20`	`42`	`84`	`170`	`340`	`682`
		`3`	`6`	`21`	`57`	`150`	`390`	`990`	`2475`
			`4`	`8`	`28`	`88`	`252`	`712`	`1992`
				`5`	`10`	`35`	`110`	`335`	`975`
					`6`	`12`	`42`	`132`	`402`
						`7`	`14`	`49`	`154`
							`8`	`16`	`56`
								`9`	`18`
									`10`

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Last modified April 25 07:53 EDT 2024. Contains 371964 sequences. (Running on oeis4.)