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Search: id:A005982
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| A005982 |
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3 up, 3 down, 3 up, ... permutations of length 2n+1.
(Formerly M5107)
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1
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| 1, 20, 1301, 202840, 61889101, 32676403052, 27418828825961, 34361404413755056, 61335081309931829401, 150221740688275657957940, 489799709605132718770274141
(list; graph; listen)
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