# A027238 (b-file synthesized from sequence entry) 0 1 1 1 2 2 3 4 4 7 5 17 6 31 7 76 8 156 9 352 10 784 11 1674 12 3962 13 8129 14 20173 15 43193 16 103522 17 230536 18 535294 19 1231484 20 2787700 21 6591350 22 14613710 23 35369380 24 77886902 25 190329098 26 428113940 27 1027180798 28 2353823912 29 5559635866 30 12950837432