# A249928 (b-file synthesized from sequence entry) 0 1 1 1 2 4 3 42 4 530 5 7489 6 113289 7 1794784 8 29397876 9 493818165 10 8460325159 11 147264321834 12 2596986868762 13 46299572773077 14 833111268412360 15 15110637698827976 16 275970530427257207 17 5070759797283817869 18 93671715612197557390 19 1738657226550598494420 20 32409645286487921390715