# A027133 (b-file synthesized from sequence entry) 0 1 1 2 2 4 3 9 4 23 5 59 6 155 7 429 8 1188 9 3298 10 9181 11 25634 12 71781 13 201569 14 571795 15 1639244 16 4702499 17 13500396 18 38790727 19 111555296 20 321100627 21 925086012 22 2667533646 23 7698716068 24 22238169212 25 64473303788 26 187912261301 27 547850119836