# A149093 (b-file synthesized from sequence entry) 0 1 1 1 2 4 3 8 4 32 5 84 6 346 7 1035 8 4398 9 14222 10 61684 11 210612 12 926902 13 3292765 14 14655294 15 53664171 16 240961436 17 903803156 18 4087224128 19 15633002424 20 71112783970 21 276447837298 22 1263743381144 23 4980630942098 24 22864035964645 25 91177566889046 26 420076191695644 27 1692376534197673 28 7821793195702664