id:A162677 - OEIS Search Results

Search: id:A162677

Displaying 1-1 of 1 results found.

page 1

Number of different fixed (possibly) disconnected polyominoes (of any area) bounded (not necessarily tightly) by an n*n square

+0
6

1, 10, 400, 57856, 31522816, 66605547520, 554222579875840, 18303191835587117056, 2408425353007592768536576, 1265177138001297870205254369280, 2655861110791164560222750369099284480 (list; graph; listen)

	OFFSET	`1,2`
	FORMULA	`a(n)=2^(n^2)-22^((n-1)n)+2^((n-1)^2)`
	EXAMPLE	`a(2)=10: the monomino, 4 dominoes (2 strictly disconnected), 4 rotations of the L tromino, and the square tetromino`
	CROSSREFS	`Cf. A162673, A162674, A162675, A162676` `Sequence in context: A013402 A013406 A098722 this_sequence A041767 A130557 A085000` `Adjacent sequences: A162674 A162675 A162676 this_sequence A162678 A162679 A162680`
	KEYWORD	`nonn`
	AUTHOR	`David Bevan (dbevan(AT)emtex.com), Jul 27 2009`

page 1

Search completed in 0.002 seconds

Last modified December 11 12:57 EST 2009. Contains 170656 sequences.

AT&T Labs Research