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 13.
A154089
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 13.
Terms
- a(0) =10296a(1) =64397a(2) =161040a(3) =382854a(4) =515649a(5) =859348a(6) =1018677a(7) =822030a(8) =546876a(9) =304400a(10) =132626a(11) =47650a(12) =14709a(13) =8418a(14) =4649a(15) =4432a(16) =2800a(17) =3706a(18) =2562a(19) =3674a(20) =2404a(21) =2404a(22) =2404a(23) =2404
External references
- oeis: A154089