# A052150 (b-file synthesized from sequence entry) 0 1 1 6 2 24 3 82 4 261 5 804 6 2440 7 7356 8 22113 9 66394 10 199248 11 597822 12 1793557 13 5380776 14 16142448 15 48427480 16 145282593 17 435847950 18 1307544040 19 3922632330 20 11767897221 21 35303691916 22 105911076024 23 317733228372 24 953199685441