login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A013582 Number of positions in game "Connect Four" (played on usual 6-row, 7-column board) after n moves, up to reflection. 4
1, 4, 25, 121, 568, 2144, 8231, 27473, 92244, 279241, 831581, 2284733, 6118941, 15465573, 37720667, 88273017, 197300906, 429114775, 881951878, 1784140720, 3373100313, 6336692489, 11005448210, 19131647821, 30415473928, 48633111249 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Sean A. Irvine, Table of n, a(n) for n = 0..42

John Tromp, John's Connect Four Playground, viewed Jan 23 2014.

Eric Weisstein's World of Mathematics, Connect-Four

CROSSREFS

Cf. A212693.

Sequence in context: A273023 A013187 A069639 * A260373 A175733 A240479

Adjacent sequences:  A013579 A013580 A013581 * A013583 A013584 A013585

KEYWORD

nonn,fini,full

AUTHOR

Russ Cox

EXTENSIONS

Name clarified by Charles R Greathouse IV, Dec 01 2013

a(3)-a(13) corrected by Sean A. Irvine, Aug 09 2018. The corrected values were confirmed by Russ Cox and extended through a(15), Aug 13 2018

a(16)-a(17) from Sean A. Irvine, Aug 15 2018

Remaining terms a(18)-a(42) from Sean A. Irvine, Oct 02 2018

STATUS

approved

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

License Agreements, Terms of Use, Privacy Policy. .

Last modified October 18 07:40 EDT 2019. Contains 328146 sequences. (Running on oeis4.)