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A006664 Number of irreducible systems of meanders.
(Formerly M1871)
+0
4
1, 1, 2, 8, 46, 322, 2546, 21870, 199494, 1904624, 18846714, 191955370, 2002141126, 21303422480, 230553207346, 2531848587534, 28159614749270, 316713536035464, 3597509926531778, 41225699113145888, 476180721050626814, 5539597373695447322, 64863295574835126394, 763984568163192551672, 9047263176444565467566 (list; graph; listen)
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Last modified December 10 12:37 EST 2009. Contains 170569 sequences.


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