# A005829 (b-file synthesized from sequence entry) 0 0 1 2 2 3 3 6 4 12 5 25 6 52 7 109 8 228 9 477 10 999 11 2093 12 4385 13 9188 14 19251 15 40336 16 84516 17 177085 18 371045 19 777448 20 1628982 21 3413196 22 7151649 23 14984807 24 31397576 25 65787152 26 137843423 27 288822495 28 605168036