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A029699 Number of words of length 4 in the n(n-1)/2 transpositions of S[ n ] equivalent to the identity. 1
0, 1, 27, 120, 340, 765, 1491, 2632, 4320, 6705, 9955, 14256, 19812, 26845, 35595, 46320, 59296, 74817, 93195, 114760, 139860, 168861, 202147, 240120, 283200, 331825, 386451, 447552, 515620, 591165 (list; graph; refs; listen; history; internal format)
OFFSET

1,3

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 1..1000

FORMULA

n*(n-1)*(3*n^2+n-12)/4

PROG

(MAGMA) [n*(n-1)*(3*n^2+n-12)/4: n in [1..45]]; // Vincenzo Librandi, Jun 30 2011

CROSSREFS

Sequence in context: A143938 A042428 A158554 * A087795 A036927 A145555

Adjacent sequences:  A029696 A029697 A029698 * A029700 A029701 A029702

KEYWORD

nonn

AUTHOR

Paolo Dominici (pl.dm(AT)libero.it)

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Last modified February 16 15:27 EST 2012. Contains 205930 sequences.