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Index numbers (compare A055089) of rows of adjacent transpositions.
Tilman Piesk, Table of n, a(n) for n = 1..2016
Tilman Piesk, Arrays of permutations (Wikiversity)
T(3,2) = Sum( 1 <= i <= 3 ) [ ( 2 + 2(i-1) )! ]
= (2+0)! + (2+2)! + (2+4)!
= 2 + 24 + 720
Sequence in context: A082017 A072985 A082187 * A225101 A021365 A179378
Adjacent sequences: A211365 A211366 A211367 * A211369 A211370 A211371
Tilman Piesk, Jul 07 2012