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A275798
One half of the number of n X n square grids with squares of two colors modulo operations of the dihedral group D_4.
1
1, 3, 51, 4274, 2105872, 4295278656, 35184441295872, 1152921514002096128, 151115727460762179076096, 79228162514269052299408048128, 166153499473114502703835144588886016, 1393796574908163946384646767619026404245504, 46768052394588893382518536034792338549485151977472
OFFSET
1,2
COMMENTS
See A054252(n, k) for the number of n X n square grids with squares from two colors modulo operations of the dihedral group D_4 with k colors of one sort.
One half of the row sums of A054252, starting with n=1. For the row sums starting with n=0 see A054247.
LINKS
FORMULA
a(n) = (1/2)*Sum_{k=0..n^2} A054252(n, k).
a(n) = A054247(n)/2, n >= 1.
CROSSREFS
Sequence in context: A003028 A069343 A084882 * A246050 A091502 A307022
KEYWORD
nonn,easy
AUTHOR
Wolfdieter Lang, Oct 03 2016
EXTENSIONS
Terms a(11) and beyond from Andrew Howroyd, Apr 26 2020
STATUS
approved