# A092176 (b-file synthesized from sequence entry) 0 0 1 1 2 3 3 6 4 12 5 21 6 39 7 72 8 138 9 269 10 526 11 1041 12 2067 13 4116 14 8214 15 16409 16 32796 17 65565 18 131104 19 262178 20 524323 21 1048614 22 2097192 23 4194347 24 8388655 25 16777265 26 33554482 27 67108916 28 134217781