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!)
A153939 Number of planar n X n X n binary triangular grids with mirror symmetry about one altitude with no more than 5 ones in any 3 X 3 X 3 subtriangle. 0
1, 2, 4, 15, 59, 432, 3332, 48304, 732710, 20860338, 622243455, 34837075520, 2043323102439, 224967044124824, 25947204334949263, 5617471553259441802, 1274053481965034919451, 542391484462533633238628 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..17.

CROSSREFS

Sequence in context: A280065 A188228 A243796 * A112281 A316661 A014517

Adjacent sequences:  A153936 A153937 A153938 * A153940 A153941 A153942

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 03 2009

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 April 12 15:00 EDT 2021. Contains 342921 sequences. (Running on oeis4.)