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A184267 Number of distinct n X 5 toroidal binary arrays. 2
8, 108, 2192, 52488, 1342208, 35792568, 981706832, 27487816992, 781874936816, 22517998808448, 655069036708592, 19215358428046176, 567592125344909792, 16865594582168158776, 503719091506096394752, 15111572745196608608736, 455125014443154512836736 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Vaclav Kotesovec, Table of n, a(n) for n = 1..660

S. N. Ethier, Counting toroidal binary arrays, arXiv preprint arXiv:1301.2352, 2013 and J. Int. Seq. 16 (2013) #13.4.7 .

FORMULA

a(n) ~ 32^n / (5*n). - Vaclav Kotesovec, Sep 04 2014

MAPLE

with(numtheory):

a:= n-> add(add(phi(c)*phi(d) *2^(5*n/ilcm(c, d)),

        d=divisors(n)), c=[1, 5])/(5*n):

seq(a(n), n=1..25);  # Alois P. Heinz, Aug 25 2012

CROSSREFS

Column 5 of A184271.

Sequence in context: A120975 A193678 A265277 * A099699 A084915 A138456

Adjacent sequences:  A184264 A184265 A184266 * A184268 A184269 A184270

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 10 2011

EXTENSIONS

More terms from Alois P. Heinz, Aug 25 2012

STATUS

approved

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Last modified January 20 14:02 EST 2020. Contains 331094 sequences. (Running on oeis4.)