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A027683 Number of independent subsets of n X n toroidal grid. 14
1, 7, 34, 743, 25531, 2406862, 464483559, 213256442503, 215560806324388, 498819827260367617, 2590618817013278596997, 30496896080418683388380966, 809724336154415150287031740151, 48609694845429192825410114233405807, 6589876632329358971395398453738256596574, 2018670118781080042934952855192359574137313799 (list; graph; refs; listen; history; internal format)
OFFSET

0,2

CROSSREFS

Cf. A006506 for flat version.

Sequence in context: A117650 A144038 A027842 * A196968 A000829 A061825

Adjacent sequences:  A027680 A027681 A027682 * A027684 A027685 A027686

KEYWORD

nonn,changed

AUTHOR

R. H. Hardin (rhhardin(AT)att.net)

EXTENSIONS

Terms a(13)-a(15) from Vaclav Kotesovec (kotesovec(AT)chello.cz), Dec 02 2011

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Last modified February 13 16:05 EST 2012. Contains 205522 sequences.