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A229650
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Cogrowth function of the group Baumslag-Solitar(8,8).
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10
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1, 4, 28, 232, 2092, 19864, 195352, 1970896, 20275660, 211823836, 2240798048, 23951367224, 258257552968, 2805581350056, 30676425237024, 337324008602512, 3727882769574860, 41381900166952348, 461201577710442388, 5158610797198820800
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OFFSET
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0,2
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COMMENTS
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a(n) is the number of words of length 2n in the letters a,a^{-1},t,t^{-1} that equal the identity of the group BS(8,8)=<a,t | ta^8=a^8t>.
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LINKS
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EXAMPLE
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For n=1 there are 4 words of length 2 equal to the identity: aa^{-1}, a^{-1}a, tt^{-1}, t^{-1}t.
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CROSSREFS
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The cogrowth sequences for BS(N,N) for N = 1..10 are A002894, A229644, A229645, A229646, A229647, A229648, A229649, A229650, A229651, A229652.
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KEYWORD
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nonn,walk
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AUTHOR
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STATUS
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approved
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