# A128092 (b-file synthesized from sequence entry) 1 2 2 4 3 6 4 16 5 30 6 60 7 126 8 256 9 504 10 1020 11 2046 12 4092 13 8190 14 16380 15 32760 16 65536 17 131070 18 262134 19 524286 20 1048560 21 2097144 22 4194300 23 8388606 24 16777200 25 33554425 26 67108860 27 134217702 28 268435440 29 536870910 30 1073741820 31 2147483646