Number of planar n X n X n binary triangular grids symmetric under 120 degree rotation with no more than 2 ones in any 4 X 4 X 4 subtriangle.
A153914
Number of planar n X n X n binary triangular grids symmetric under 120 degree rotation with no more than 2 ones in any 4 X 4 X 4 subtriangle.
Terms
- a(0) =1a(1) =2a(2) =1a(3) =1a(4) =2a(5) =4a(6) =9a(7) =26a(8) =49a(9) =114a(10) =335a(11) =860a(12) =2642a(13) =11403a(14) =31366a(15) =122074a(16) =649249a(17) =2617092a(18) =13723850a(19) =92885894a(20) =495630474a(21) =3323403054a(22) =28712335687a(23) =193014843154
External references
- oeis: A153914