# A052858 (b-file synthesized from sequence entry) 0 0 1 0 2 2 3 3 4 16 5 65 6 456 7 3157 8 28624 9 276705 10 3136240 11 38531141 12 528468744 13 7837577761 14 126588882616 15 2194957583925 16 40854219413536 17 810192673705793 18 17082845929433952 19 381225135102420997