# A196417 (b-file synthesized from sequence entry) 1 1 2 2 3 5 4 14 5 42 6 131 7 417 8 1341 9 4334 10 14042 11 45562 12 148029 13 481804 14 1572625 15 5156025 16 17018505 17 56717910 18 191540940 19 658084182 20 2309516616