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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 (list; graph; refs; listen; history; text; internal format)
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

Andrew Howroyd, Table of n, a(n) for n = 1..50

FORMULA

a(n) = (1/2)*Sum_{k=0..n^2} A054252(n, k).

a(n) = A054247(n)/2, n >= 1.

CROSSREFS

Cf. A054252, A054247.

Sequence in context: A003028 A069343 A084882 * A246050 A091502 A307022

Adjacent sequences:  A275795 A275796 A275797 * A275799 A275800 A275801

KEYWORD

nonn,easy

AUTHOR

Wolfdieter Lang, Oct 03 2016

EXTENSIONS

Terms a(11) and beyond from Andrew Howroyd, Apr 26 2020

STATUS

approved

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Last modified October 28 04:43 EDT 2021. Contains 348313 sequences. (Running on oeis4.)