# A108360 (b-file synthesized from sequence entry) 0 1 1 2 2 5 3 12 4 30 5 76 6 194 7 496 8 1267 9 3230 10 8215 11 20844 12 52768 13 133304 14 336100 15 845888 16 2125381 17 5332058 18 13357833 19 33419820 20 83510018 21 208437060 22 519691110 23 1294430448 24 3221081335 25 8008262966 26 19893476315 27 49378623564 28 122473408452