# A076836 (b-file synthesized from sequence entry) 1 1 2 1 3 2 4 3 5 6 6 13 7 30 8 76 9 220 10 700 11 2520 12 10503 13 51368 14 306328 15 2313432 16 23069977 17 314605256 18 5991456377 19 160321885780 20 6008649072476 21 313490988938680 22 22641945794083024 23 2254587340059129076 24 308683056074116543631