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 A097547 a(n) = n^(2^n). 3
 0, 1, 16, 6561, 4294967296, 23283064365386962890625, 63340286662973277706162286946811886609896461828096, 1487815647197611695910312681741273570332356717154798949898498305086387315423300999654757561928633305897036801 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 COMMENTS Number of mappings from 2^X to X where X is an n-set. LINKS Vincenzo Librandi, Table of n, a(n) for n = 0..9 (shortened by N. J. A. Sloane, Jan 13 2019) Yasutoshi Kohmoto, The Other Side of Mathematics [broken link?] Yasutoshi Kohmoto, The Other Side of Mathematics [via Internet Archive Wayback-machine] FORMULA From R. J. Mathar, Apr 23 2007: (Start) a(6) = A080174(6) - 1. a(5) = A013737(10) = A013835(6). a(4) = A000079(32) = A002489(4) = A000215(5)-1. (End) Sum_{n>=1} 1/a(n) = A216992. - Amiram Eldar, Nov 19 2020 MATHEMATICA Table[n^2^n, {n, 0, 7}] (* Vladimir Joseph Stephan Orlovsky, Mar 01 2010 *) PROG (MAGMA) [n^(2^n): n in [0..12]]; // Vincenzo Librandi, May 25 2011 (PARI) a(n)=n^(1<

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Last modified May 16 14:39 EDT 2021. Contains 343949 sequences. (Running on oeis4.)