A241806 Two-colorings of triangular arrays under rotational symmetries.

1, 2, 4, 24, 352, 10944, 699136, 89479168, 22906494976, 11728124051456, 22906494976, 11728124051456, 12009599006670848, 24595658764948865024, 100743818301219142631424, 825293359523586851364405248, 13521606402434446949321074016256

Offset

1,2

Links

Table of n, a(n) for n=1..17.

StackExchange, two-colorings of triangular arrays

Maple

Q:= proc(n)
    if n mod 3 = 1 then 1/3*2^(1/2*n*(n + 1)) + 1/3*2^(2 + 1/6*(n - 1)*(n + 2))
    else 1/3*2^(1/2*n*(n + 1)) + 1/3*2^(1 + 1/6*n*(n + 1))
    end if
end proc

Crossrefs

Sequence in context: A047677 A030276 A081476 * A009273 A332539 A296787

Adjacent sequences: A241803 A241804 A241805 * A241807 A241808 A241809

Keyword

nonn

Author

Marko Riedel, Apr 28 2014

Status

approved