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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<<n) \\ Charles R Greathouse IV, May 25, 2011

CROSSREFS

Cf. A020955, A216992.

Sequence in context: A159403 A221199 A017008 * A088654 A079920 A203390

Adjacent sequences:  A097544 A097545 A097546 * A097548 A097549 A097550

KEYWORD

nonn

AUTHOR

Yasutoshi Kohmoto, Aug 28 2004

STATUS

approved

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