Number of planar triangular n X n X n nonnegative integer grids with mirror symmetry about one altitude with every similarly oriented 4 X 4 X 4 subtriangle summing to 9.
A154073
Number of planar triangular n X n X n nonnegative integer grids with mirror symmetry about one altitude with every similarly oriented 4 X 4 X 4 subtriangle summing to 9.
Terms
- a(0) =252a(1) =2298a(2) =1670a(3) =5721a(4) =2507a(5) =7335a(6) =2348a(7) =4388a(8) =1087a(9) =1406a(10) =468a(11) =952a(12) =386a(13) =767a(14) =373a(15) =848a(16) =373a(17) =812a(18) =373a(19) =848a(20) =373a(21) =734a(22) =370a(23) =848a(24) =373a(25) =734a(26) =373a(27) =848a(28) =373a(29) =734
External references
- oeis: A154073