Number of planar n X n X n binary triangular grids symmetric both under 120 degree rotation and reflection with no more than 2 ones in any 3 X 3 X 3 subtriangle.
A153913
Number of planar n X n X n binary triangular grids symmetric both under 120 degree rotation and reflection with no more than 2 ones in any 3 X 3 X 3 subtriangle.
Terms
- a(0) =1a(1) =2a(2) =26a(3) =129a(4) =122a(5) =239a(6) =1864a(7) =1591a(8) =5085a(9) =36162a(10) =47771a(11) =138927a(12) =1581118a(13) =1910444a(14) =8834202a(15) =91938135a(16) =174908406a(17) =743306687a(18) =12298725970a(19) =21309347213a(20) =143524473375
External references
- oeis: A153913