A081720 - OEIS

login

The OEIS is supported by the many generous donors to the OEIS Foundation.

A081720 as a triangular array

1

1 3

1 4 10

1 6 21 55

1 8 39 136 377

1 13 92 430 1505 4291

1 18 198 1300 5895 20646 60028

1 30 498 4435 25395 107331 365260 1058058

1 46 1219 15084 110085 563786 2250311 7472984 21552969

1 78 3210 53764 493131 3037314

A081720 as a square array

`1`	`1`	`1`	`1`	`1`	`1`	`1`	`1`	`1`	`1`
`3`	`4`	`6`	`8`	`13`	`18`	`30`	`46`	`78`
`10`	`21`	`39`	`92`	`198`	`498`	`1219`	`3210`
`55`	`136`	`430`	`1300`	`4435`	`15084`	`53764`
`377`	`1505`	`5895`	`25395`	`110085`	`493131`
`4291`	`20646`	`107331`	`563786`	`3037314`
`60028`	`365260`	`2250311`
`1058058`	`7472984`
`21552969`

A081720 as an upper right triangle

`1`	`1`	`1`	`1`	`1`	`1`	`1`	`1`	`1`	`1`
	`3`	`4`	`6`	`8`	`13`	`18`	`30`	`46`	`78`
		`10`	`21`	`39`	`92`	`198`	`498`	`1219`	`3210`
			`55`	`136`	`430`	`1300`	`4435`	`15084`	`53764`
				`377`	`1505`	`5895`	`25395`	`110085`	`493131`
					`4291`	`20646`	`107331`	`563786`	`3037314`
						`60028`	`365260`	`2250311`
							`1058058`	`7472984`
								`21552969`

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified April 18 08:27 EDT 2024. Contains 371769 sequences. (Running on oeis4.)