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A027683 Number of independent vertex sets of the n X n torus grid graph. 20
1, 7, 34, 743, 25531, 2406862, 464483559, 213256442503, 215560806324388, 498819827260367617, 2590618817013278596997, 30496896080418683388380966, 809724336154415150287031740151, 48609694845429192825410114233405807, 6589876632329358971395398453738256596574, 2018670118781080042934952855192359574137313799 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..16.

V. Kotesovec, Non-attacking chess pieces, 6ed, 2013, p. 73, 405.

Eric Weisstein's World of Mathematics, Independent Vertex Set

Eric Weisstein's World of Mathematics, Torus Grid Graph

CROSSREFS

Cf. A006506 for flat version.

Cf. A201626, A212270.

Sequence in context: A144038 A027842 A232043 * A196968 A000829 A247158

Adjacent sequences:  A027680 A027681 A027682 * A027684 A027685 A027686

KEYWORD

nonn,nice,hard

AUTHOR

R. H. Hardin

EXTENSIONS

Terms a(13)-a(15) from Vaclav Kotesovec, Dec 02 2011

STATUS

approved

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Last modified January 28 03:28 EST 2020. Contains 331314 sequences. (Running on oeis4.)