# A148021 (b-file synthesized from sequence entry) 0 1 1 1 2 2 3 3 4 8 5 17 6 46 7 127 8 385 9 1138 10 3557 11 11332 12 36949 13 122262 14 415624 15 1427497 16 4962532 17 17550068 18 62626410 19 225373569 20 821372128 21 3016299522 22 11145989333 23 41593856129 24 156190755015 25 589476598936 26 2241899251552 27 8571688434648 28 32908712661363 29 127130928921437 30 493347655801103 31 1921175991853967