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 A073889 a(1) = 1, a(2) = 3; for n>2, a(n) = {a(n-1)*a(n+1)}^(1/n) or a(n+1) = a(n)^n/a(n-1). 3
 1, 3, 9, 243, 387420489, 35917545547686059365808220080151141317043 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS MAPLE A073889:= proc(n) option remember; if n<3 then 2*n-1; else a(n-1)^(n-1)/a(n-2); fi; end; seq(A073889(n), n = 1..7); # G. C. Greubel, May 18 2020 MATHEMATICA a[n_]:= a[n]= If[n<3, 2*n-1, a[n-1]^(n-1)/a[n-2]]; Table[a[n], {n, 7}] (* G. C. Greubel, May 18 2020 *) PROG (Magma) I:=[1, 3]; [n le 2 select I[n] else Self(n-1)^(n-1)/Self(n-2): n in [1..7]]; # G. C. Greubel, May 18 2020 (Sage) def a(n): if (n<3): return 2*n-1 else: return a(n-1)^(n-1)/a(n-2) [a(n) for n in (1..7)] # G. C. Greubel, May 18 2020 CROSSREFS Cf. A058798, A073888. Sequence in context: A279834 A091409 A027891 * A332586 A211898 A318970 Adjacent sequences: A073886 A073887 A073888 * A073890 A073891 A073892 KEYWORD nonn AUTHOR Amarnath Murthy, Aug 17 2002 EXTENSIONS The next term is too large to include. STATUS approved

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Last modified January 28 05:03 EST 2023. Contains 359850 sequences. (Running on oeis4.)