A083402 - OEIS

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A083402

Let A_n be the upper triangular matrix in the group GL(n,2) that has zero entries below the main diagonal and 1 elsewhere; a(n) is the size of the conjugacy class of this matrix in GL(n,2).

1, 3, 42, 2520, 624960, 629959680 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,2`
	FORMULA	`a(n) = A002884(n) / 2^(n-1).`
	EXAMPLE	`For example for n=4 the matrix is / 1,1,1,1 / 0,1,1,1 / 0,0,1,1 / 0,0,0,1 /.`
	CROSSREFS	`Cf. A002884, A070731, A082877, A062383.` `Sequence in context: A078601 A195010 A156108 * A145984 A157552 A058808` `Adjacent sequences: A083399 A083400 A083401 * A083403 A083404 A083405`
	KEYWORD	`nonn`
	AUTHOR	`Yuval Dekel (dekelyuval(AT)hotmail.com), Jun 12 2003`

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Last modified February 15 16:49 EST 2012. Contains 205824 sequences.