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A211367 Array read by antidiagonals: T(m,n) = m * Sum(1<=i<=m) (m+n-2+i)! 1
1, 2, 16, 6, 60, 450, 24, 288, 2592, 23616, 120, 1680, 17640, 184800, 2045400, 720, 11520, 138240, 1635840, 20188800, 263727360, 5040, 90720, 1224720, 16148160, 219769200, 3137732640, 47249833680, 40320, 806400, 12096000, 175795200 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Index numbers (compare A055089) of chains of transpositions.

LINKS

Tilman Piesk, Table of n, a(n) for n = 1..2016

Tilman Piesk, Arrays of permutations (Wikiversity)

EXAMPLE

T(3,2) = 3 * Sum( 1 <= i <= 3 ) [ (3+i)! ]

= 3 * ( (3+1)! + (3+2)! + (3+3)! )

= 3 * ( 24 + 120 + 720 )

= 2592

CROSSREFS

Cf. A055089.

Sequence in context: A232503 A025586 A087251 * A220314 A110008 A110875

Adjacent sequences:  A211364 A211365 A211366 * A211368 A211369 A211370

KEYWORD

nonn,tabl

AUTHOR

Tilman Piesk, Jul 07 2012

STATUS

approved

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Last modified August 27 17:21 EDT 2014. Contains 246147 sequences.