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!)
A011961 Number of ferrites M_4Y_n that repeat after 6n+20 layers. 0
0, 1, 2, 2, 3, 6, 6, 9, 13, 15, 18, 25, 27, 34, 42, 47, 54, 67, 72, 84 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

REFERENCES

T. J. McLarnan, The numbers of polytypes ..., Zeits. Krist. 155, 269-291 (1981).

LINKS

Table of n, a(n) for n=1..20.

CROSSREFS

Sequence in context: A035560 A077012 A078921 * A182713 A229626 A091770

Adjacent sequences:  A011958 A011959 A011960 * A011962 A011963 A011964

KEYWORD

nonn,easy

AUTHOR

N. J. A. Sloane.

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 July 12 13:01 EDT 2020. Contains 335661 sequences. (Running on oeis4.)