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A281345
Related to enumeration of sets of non-intersecting circles in the plane.
0
1, 2, 8, 26, 99, 364, 1417, 5541, 22193, 89799, 368160, 1523020, 6355895, 26713307, 112999390, 480666202, 2054863538, 8823764846, 38042350806, 164609190230, 714613926565, 3111673137244, 13586653421083, 59474496929094, 260953934483595, 1147456294303011, 5055688301028252, 22317001824137254
OFFSET
0,2
COMMENTS
Needs a more precise definition.
LINKS
CROSSREFS
Sequence in context: A301699 A129368 A357221 * A348240 A128238 A110156
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Jan 20 2017
STATUS
approved