# A139333 (b-file synthesized from sequence entry) 1 1 2 1 3 3 4 7 5 15 6 32 7 68 8 144 9 302 10 633 11 1328 12 2783 13 5832 14 12219 15 25604 16 53648 17 112408 18 235529 19 493503 20 1034034 21 2166605 22 4539675 23 9511953 24 19930339 25 41759920 26 87499309 27 183336777