# A018159 (b-file synthesized from sequence entry) 0 1 1 1 2 3 3 5 4 9 5 16 6 27 7 48 8 84 9 147 10 256 11 445 12 776 13 1351 14 2352 15 4096 16 7131 17 12416 18 21618 19 37640 20 65536 21 114104 22 198668 23 345901 24 602248 25 1048576 26 1825676 27 3178688 28 5534417 29 9635980 30 16777216 31 29210829 32 50859008