# A094039 (b-file synthesized from sequence entry) 0 0 1 1 2 2 3 6 4 16 5 46 6 132 7 386 8 1136 9 3366 10 10012 11 29866 12 89256 13 267086 14 799892 15 2396946 16 7185376 17 21545206 18 64613772 19 193797626 20 581305496 21 1743741726 22 5230875652 23 15691927906 24 47074385616 25 141220360646 26 423655489532