Number of planar triangular n X n X n nonnegative integer grids with mirror symmetry about one altitude with every similarly oriented 5 X 5 X 5 subtriangle summing to 9.
A154075
Number of planar triangular n X n X n nonnegative integer grids with mirror symmetry about one altitude with every similarly oriented 5 X 5 X 5 subtriangle summing to 9.
Terms
- a(0) =1650a(1) =6592a(2) =10881a(3) =16801a(4) =14513a(5) =14220a(6) =11083a(7) =6900a(8) =3475a(9) =1606a(10) =588a(11) =460a(12) =253a(13) =244a(14) =241a(15) =240a(16) =300a(17) =240a(18) =240a(19) =240a(20) =240a(21) =300a(22) =240a(23) =240a(24) =240a(25) =240a(26) =300a(27) =240a(28) =240a(29) =240
External references
- oeis: A154075