# A019175 (b-file synthesized from sequence entry) 3 0 4 0 5 6 6 6 7 6 8 27 9 52 10 105 11 280 12 592 13 1428 14 3653 15 8294 16 20587 17 52878 18 130568 19 331526 20 859744 21 2219252 22 5778757 23 15171768 24 39925520 25 105556976 26 279913825 27 743392894 28 1979348991 29 5279012264 30 14094315773 31 37689916670