74793domain: NAppears in sequencesa(n) = ceiling(n*phi^19), where phi is the golden ratio, A001622.at n=8A004974Expansion of (1-x)/(1-x-2x^2+x^4).at n=19A052969The (1,4)-entry in the matrix M^n, where M is the 4 X 4 matrix {{0, -1, -1, 1}, {1, -1, 0, 0}, {0, 1, 1, 0}, {0, 0, 1, 1 }}.at n=40A122789