# A261186 (b-file synthesized from sequence entry) 2 4 3 35 4 252 5 1716 6 11440 7 75582 8 497420 9 3268760 10 21474180 11 141120525 12 927983760 13 6107086800 14 40225345056 15 265182149218 16 1749695026860 17 11554258485616 18 76360380541900 19 505037289962205 20 3342649210440540 21 22138745874816900 22 146721427591999680