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!)
A123821 Number of ways to build a contiguous building with n LEGO blocks of size 2 X 2 on top of a fixed block of the same size. 0

%I #6 Oct 09 2013 14:20:53

%S 9,97,1349,20288,329707,5574248,97506021,1747201171,31923371982,

%T 592403479154

%N Number of ways to build a contiguous building with n LEGO blocks of size 2 X 2 on top of a fixed block of the same size.

%C The base block is not counted among the n and must be the only block in the bottom layer of the building

%Y Cf. A112389, A123762 - A123827, A123829 - A123849.

%K nonn,hard

%O 1,1

%A _Søren Eilers_, Oct 29 2006

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 March 28 08:02 EDT 2024. Contains 371236 sequences. (Running on oeis4.)