82146domain: NAppears in sequencesNumber of ways to place a non-attacking white and black pawn on n X n chessboard.at n=17A035290Expansion of 4th power of continued fraction 1/ ( 1+q/ ( 1+q^2/ ( 1+q^3/ ( 1+q^4/... )))).at n=42A055103Numbers k such that k^2 +- k +- 1 is prime for all four possibilities.at n=17A236056