# A004734 (b-file synthesized from sequence entry) 1 1 2 8 3 3 4 32 5 5 6 64 7 35 8 512 9 63 10 1024 11 231 12 4096 13 429 14 8192 15 6435 16 131072 17 12155 18 262144 19 46189 20 1048576 21 88179 22 2097152 23 676039 24 16777216 25 1300075 26 33554432 27 5014575 28 134217728 29 9694845 30 268435456 31 300540195