The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A180861 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
Showing entries 1-10 | older changes

A180861

Wiener index of the n-pan graph.
(history; published version)

#26 by Susanna Cuyler at Fri Sep 08 13:35:53 EDT 2017

STATUS

proposed

approved

#25 by Bruno Berselli at Fri Sep 08 11:21:01 EDT 2017

STATUS

editing

proposed

#24 by Bruno Berselli at Fri Sep 08 11:20:56 EDT 2017

EXTENSIONS

a(1)-a(2) and new offset from Eric W. Weisstein, Sep 08 2017

#23 by Bruno Berselli at Fri Sep 08 11:20:39 EDT 2017

EXTENSIONS

a(1)-a(2), new definition and offset from Eric W. Weisstein, Sep 08 2017

#22 by Bruno Berselli at Fri Sep 08 11:19:56 EDT 2017

STATUS

proposed

editing

#21 by Bruno Berselli at Fri Sep 08 11:19:05 EDT 2017

STATUS

editing

proposed

#20 by Bruno Berselli at Fri Sep 08 11:18:59 EDT 2017

FORMULA

G.f.: x^3*(1 + 2*x - x^2 + x^4)/((1 - x)^4*(1 + x)^2). (End)

#19 by Bruno Berselli at Fri Sep 08 11:18:28 EDT 2017

OFFSET

3,1,2

FORMULA

a(n) = A180860(n,1) for n>2.

EXTENSIONS

New a(1)-a(2), new definition and a(1)-a(2) offset from Eric W. Weisstein, Sep 08 2017

#18 by Bruno Berselli at Fri Sep 08 11:15:05 EDT 2017

EXTENSIONS

New definition and a(1)-a(2) from Eric W. Weisstein, Sep 08 2017

#17 by Bruno Berselli at Fri Sep 08 11:14:20 EDT 2017

FORMULA

a(n) = (-2 + 15*n + 4*n^2 + 2*n^3 + (-1)^n* (2 + n))/16. - Eric W. Weisstein, Sep 08 2017