Number of planar triangular n X n X n nonnegative integer grids symmetric under 120 degree rotation with every similarly oriented 5 X 5 X 5 subtriangle summing to 15.
A154093
Number of planar triangular n X n X n nonnegative integer grids symmetric under 120 degree rotation with every similarly oriented 5 X 5 X 5 subtriangle summing to 15.
Terms
- a(0) =126a(1) =1131a(2) =9526a(3) =8779a(4) =13757a(5) =78476a(6) =63531a(7) =47267a(8) =239549a(9) =59060
External references
- oeis: A154093