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A007776
Number of connected posets with n elements of height 1.
+0
1
1, 2, 4, 10, 27, 88, 328, 1460, 7799, 51196, 422521, 4483460, 62330116, 1150504224, 28434624153, 945480850638, 42417674401330, 2572198227615998, 211135833162079184, 23487811567341121158, 3545543330739039981738
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Maintained by
N. J. A. Sloane
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njas@research.att.com
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Last modified November 27 14:50 EST 2009. Contains 167570 sequences.
AT&T Labs Research
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