103235domain: NAppears in sequencesRow sums of a triangle related to the Jacobsthal polynomials.at n=18A108742The (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=41A122789