79753domain: NAppears in sequencesNumber of planar triangular n X n X n nonnegative integer grids with every similarly oriented 5 X 5 X 5 subtriangle summing to 5.at n=1A154053G.f. satisfies: A(x) = x + A(x^2 + A(x^3 + A(x^4 + A(x^5 +...)))).at n=19A228835