A268740 - OEIS

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A268740 as a triangular array

0

1 1

2 4 2

5 15 15 5

10 48 80 48 10

20 145 396 396 145 20

38 420 1788 2876 1788 420 38

71 1183 7831 19591 19591 7831 1183 71

130 3264 33170 128232 200204 128232 33170 3264 130

235 8865 137868 816009 1971414

A268740 as a square array

`0`	`1`	`2`	`5`	`10`	`20`	`38`	`71`	`130`	`235`
`1`	`4`	`15`	`48`	`145`	`420`	`1183`	`3264`	`8865`
`2`	`15`	`80`	`396`	`1788`	`7831`	`33170`	`137868`
`5`	`48`	`396`	`2876`	`19591`	`128232`	`816009`
`10`	`145`	`1788`	`19591`	`200204`	`1971414`
`20`	`420`	`7831`	`128232`
`38`	`1183`	`33170`
`71`	`3264`
`130`

A268740 as an upper right triangle

`0`	`1`	`2`	`5`	`10`	`20`	`38`	`71`	`130`	`235`
	`1`	`4`	`15`	`48`	`145`	`420`	`1183`	`3264`	`8865`
		`2`	`15`	`80`	`396`	`1788`	`7831`	`33170`	`137868`
			`5`	`48`	`396`	`2876`	`19591`	`128232`	`816009`
				`10`	`145`	`1788`	`19591`	`200204`	`1971414`
					`20`	`420`	`7831`	`128232`
						`38`	`1183`	`33170`
							`71`	`3264`
								`130`

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Last modified April 19 21:09 EDT 2024. Contains 371798 sequences. (Running on oeis4.)