login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A123786 Number of ways, counted up to symmetry, to build a contiguous building with n LEGO blocks of size 1x5. 0
1, 18, 952, 60878, 4319328, 325354277, 25539764546, 2066227060325 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..8.

CROSSREFS

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

Sequence in context: A214160 A242446 A160013 * A333089 A129009 A042409

Adjacent sequences:  A123783 A123784 A123785 * A123787 A123788 A123789

KEYWORD

nonn,hard

AUTHOR

Søren Eilers, Oct 29 2006

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 June 21 02:28 EDT 2021. Contains 345342 sequences. (Running on oeis4.)