The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A372191 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
Showing entries 1-10 | older changes

A372191

Number of unlabeled simple graphs covering n vertices with a unique undirected cycle of length > 2.
(history; published version)

#17 by OEIS Server at Thu Aug 01 11:59:08 EDT 2024

LINKS

Andrew Howroyd, <a href="/A372191/b372191_1.txt">Table of n, a(n) for n = 0..500</a>

#16 by Alois P. Heinz at Thu Aug 01 11:59:08 EDT 2024

STATUS

reviewed

approved

Discussion

Thu Aug 01

11:59

OEIS Server: Installed first b-file as b372191.txt.

#15 by Joerg Arndt at Thu Aug 01 11:34:05 EDT 2024

STATUS

proposed

reviewed

#14 by Andrew Howroyd at Thu Aug 01 11:14:18 EDT 2024

STATUS

editing

proposed

#13 by Andrew Howroyd at Thu Aug 01 11:13:19 EDT 2024

LINKS

Andrew Howroyd, <a href="/A372191/b372191_1.txt">Table of n, a(n) for n = 0..500</a>

#12 by Andrew Howroyd at Wed Jul 31 22:29:18 EDT 2024

DATA

0, 0, 0, 1, 2, 6, 16, 43, 117, 319, 875, 2409, 6692, 18614, 52099, 146186, 411720, 1162295, 3289994, 9330913, 26517036, 75481622, 215201178, 614398459, 1756392061, 5026955216, 14403488345, 41311616835, 118601561506, 340795908579, 980078195995

FORMULA

First differences of A372192A236570.

CROSSREFS

The non-covering version is A372192, A236570, labeled A372193.

KEYWORD

nonn,more

nonn

EXTENSIONS

a(7) onwards from Andrew Howroyd, Jul 31 2024

STATUS

approved

editing

#11 by Michael De Vlieger at Sun Apr 28 23:48:56 EDT 2024

STATUS

proposed

approved

#10 by Gus Wiseman at Sun Apr 28 22:35:19 EDT 2024

STATUS

editing

proposed

#9 by Gus Wiseman at Sun Apr 28 22:35:12 EDT 2024

CROSSREFS

A000088 counts unlabeled graphs, labeled A006125.

A002494 counts unlabeled covering graphs, labeled A006129.

A006125 counts graphs, unlabeled A000088.

A006129 counts covering graphs, unlabeled A002494.

#8 by Gus Wiseman at Sun Apr 28 16:53:57 EDT 2024

CROSSREFS

`Cf. A000055, `A054548, `A121251, A137916, A137917, A137918, A140637, `A213434, `A322661, A370167, A370169, `A372169.