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A007123
Number of connected unit interval graphs with n nodes; also bracelets (turn over necklaces) with n black beads and n-1 white beads.
(Formerly M1218)
+0
10
1, 1, 2, 4, 10, 26, 76, 232, 750, 2494, 8524, 29624, 104468, 372308, 1338936, 4850640, 17685270, 64834550, 238843660, 883677784, 3282152588, 12233309868, 45741634536, 171530482864, 644953425740, 2430975800876
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Maintained by
N. J. A. Sloane
(
njas@research.att.com
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Last modified November 29 12:46 EST 2009. Contains 167659 sequences.
AT&T Labs Research
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