# A161881 (b-file synthesized from sequence entry) 0 1 1 1 2 2 3 8 4 46 5 333 6 2822 7 26884 8 280778 9 3162129 10 37962174 11 481796692 12 6424120440 13 89561323131 14 1300606338522 15 19614272779492 16 306422062160964 17 4948682216714809 18 82474329755007710 19 1416291364674413764 20 25027636488359996744 21 454585893218323184316