A153925 - OEIS

A153925

Number of planar n X n X n binary triangular grids symmetric both under 120 degree rotation and reflection with no more than 3 ones in any 4 X 4 X 4 subtriangle.

%I #5 Apr 28 2021 00:16:57

%S 1,2,59,113,284,518,1796,3449,13001,33157,125582,347073,1750397,

%T 4967495,26187751,100593004,556134332,2202434132,16364033894,

%U 67618894318,527057394363,2923317994023,23673541188119,137414022400841

%N Number of planar n X n X n binary triangular grids symmetric both under 120 degree rotation and reflection with no more than 3 ones in any 4 X 4 X 4 subtriangle.

%K nonn

%O 0,2

%A _R. H. Hardin_, Jan 03 2009