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!)
A155410 Number of ways to place zero or more nonadjacent 1,0 1,1 2,1 3,2 3,3 4,2 5,2 5,3 polyhexes in any orientation on a planar n X n X n triangular grid. 0

%I #5 Sep 03 2022 21:04:57

%S 1,7,19,37,94,297,1458,9766,53099,308101,2235851,20215398,229099105,

%T 2888943253,39401146662,624852187290

%N Number of ways to place zero or more nonadjacent 1,0 1,1 2,1 3,2 3,3 4,2 5,2 5,3 polyhexes in any orientation on a planar n X n X n triangular grid.

%C Same series for 1,0 1,1 2,0 3,0 3,1 4,1 5,2 5,3 polyhexes.

%e Maximal 10 X 10 X 10 example

%e ............0

%e ...........0.0

%e ..........1.1.0

%e .........0.1.0.0

%e ........1.1.0.0.0

%e .......0.0.1.0.1.1

%e ......1.0.1.1.0.1.0

%e .....1.1.0.0.0.0.1.1

%e ....0.0.1.1.1.0.1.0.0

%e ...0.0.1.0.1.0.1.1.0.0

%K nonn

%O 5,2

%A _R. H. Hardin_, Jan 22 2009

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 25 11:30 EDT 2024. Contains 371967 sequences. (Running on oeis4.)