# A006920 (b-file synthesized from sequence entry) 1 1 2 1 3 2 4 21 5 32 6 331 7 433 8 4351 9 53621 10 647221 11 7673221 12 8883233 13 891132333 14 8101532334101 15 101118423351110001 16 141220533351220001001 17 17142355335122101100101 18 23162558335122102101101001 19 30192751033612210211110100201 20 3823295114361321021111110020101001