# A148073 (b-file synthesized from sequence entry) 0 1 1 1 2 2 3 4 4 9 5 21 6 56 7 153 8 431 9 1269 10 3748 11 11283 12 34892 13 109201 14 346671 15 1113914 16 3599997 17 11754161 18 38738445 19 128543670 20 429827021 21 1444670782 22 4879545858 23 16575721093 24 56568953256 25 193962159926 26 667744908521 27 2306563486959 28 7996271742308 29 27813368946061 30 97050437964778 31 339653854810804 32 1191781442742137