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A125295
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Number of different non-self-crossing ways of moving a tower of Hanoi from one peg onto another peg.
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2
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OFFSET
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0,2
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COMMENTS
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In other words, a sequence of moves starting with all disks on the starting peg, ending with all disks on the destination peg and never more than once producing the same distribution of disks among the pegs (assuming 3 pegs).
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LINKS
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FORMULA
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a(n+1) = (a(n)^2)*(a(n)+1).
a(n) ~ c^(3^n), where c = 1.321902354497090972160055360813404141485787154023407081... . Vaclav Kotesovec, Mar 11 2016
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MAPLE
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f:= proc(n) option remember; if n = 0 then 1 else f(n-1)^2*(f(n-1)+1); fi; end; seq(f(n), n=0..7);
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MATHEMATICA
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RecurrenceTable[{a[n+1] == a[n]^2 * (a[n]+1), a[0]==1}, a, {n, 0, 7}] (* Vaclav Kotesovec, Mar 11 2016 *)
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PROG
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(Scheme)
(define (next n) (* n n (+ n 1)))
(define (list-elements nr-of-elements n0 next)
(let list-elements ((i 0) (n n0))
(show i n)
(let ((i (add1 i)))
(if (< i nr-of-elements) (list-elements i (next n))))))
(define (show i n) (printf "N(~a)=~a~n~n" i n))
(list-elements 6 1 next)
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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Checked by N. J. A. Sloane, Feb 10 2007. The next term is too large to include.
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STATUS
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approved
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