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!)
A141513 Number of n X n binary matrices, symmetric under 90-degree rotation, with no more than 3 ones in any 2 X 2 subblock. 1
1, 2, 1, 7, 8, 101, 207, 5120, 20417, 961969, 7321136, 661511545, 9650955373, 1669696876968, 46646811310045, 15458287165896835, 827194455797432320, 525025121630724209885, 53809855627730048960875 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

R. H. Hardin, Table of n, a(n) for n = 0..25

CROSSREFS

Sequence in context: A021463 A199964 A217107 * A258058 A238223 A102817

Adjacent sequences:  A141510 A141511 A141512 * A141514 A141515 A141516

KEYWORD

nonn

AUTHOR

R. H. Hardin, Aug 10 2008

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 May 30 15:10 EDT 2020. Contains 334726 sequences. (Running on oeis4.)