# A018138 (b-file synthesized from sequence entry) 0 1 1 1 2 2 3 3 4 5 5 9 6 13 7 21 8 33 9 52 10 81 11 125 12 195 13 302 14 469 15 729 16 1131 17 1755 18 2724 19 4227 20 6561 21 10181 22 15800 23 24519 24 38050 25 59049 26 91634 27 142203 28 220677 29 342457 30 531441 31 824714 32 1279829 33 1986097 34 3082116 35 4782969