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

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A247744 Total number of X shapes in all tilings of a 5 X n rectangle with pentominoes of any shape. 2

%I #10 Feb 06 2017 18:37:00

%S 0,0,0,1,8,76,752,7728,76138,683740,6016612,52483260,453461612,

%T 3873299197,32718505462,274368261226,2287565667766,18973561019204,

%U 156622182476404,1287479429817295,10545476231546336,86101164740284870,700977394316933694,5692064258367318333

%N Total number of X shapes in all tilings of a 5 X n rectangle with pentominoes of any shape.

%H Alois P. Heinz, <a href="/A247744/b247744.txt">Table of n, a(n) for n = 0..500</a>

%H Wikipedia, <a href="https://en.wikipedia.org/wiki/Pentomino">Pentomino</a>

%F a(n) = Sum_{k>0} k * A247711(n,k).

%Y Cf. A174249, A233427, A247711.

%K nonn

%O 0,5

%A _Alois P. Heinz_, Sep 23 2014

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 17 11:20 EDT 2024. Contains 371763 sequences. (Running on oeis4.)