

A014525


Order of shuffle group for deck of 3n cards.


2



1, 6, 720, 72, 239500800, 1307674368000, 6402373705728000, 51090942171709440000, 310224200866619719680000, 648, 265252859812191058636308480000000
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OFFSET

0,2


REFERENCES

W. Bosma et al., Solving Problems with MAGMA, Sect. 2.2.3.
Cannon and Playoust, An Introduction to MAGMA, Section 6.3.1.


LINKS

Sean A. Irvine, Table of n, a(n) for n = 0..33


FORMULA

Conjecture: a(3^m) = (m+1) * 6^(m+1), a(4*m) = (1/2) * (3*4*m)!, otherwise a(n) = (3*n)!.  Sean A. Irvine, Nov 07 2018


PROG

(MAGMA) SG := function(n) m := 3*n; G := SymmetricGroup(m); p := &*[ G  (i, i+2*n): i in [ 1..n ]]; q := &*[ G  (i, i+n, i+2*n): i in [ 1..n ]]; s := [ ((i1) mod 3 ) * n + (i1) div 3 + 1: i in [ 1..m ]]; return Order(sub<G  p, q, s >); end function;


CROSSREFS

Cf. A014766.
Sequence in context: A218559 A201391 A289367 * A289747 A188960 A100732
Adjacent sequences: A014522 A014523 A014524 * A014526 A014527 A014528


KEYWORD

nonn


AUTHOR

N. J. A. Sloane.


STATUS

approved



