# A067053 (b-file synthesized from sequence entry) 1 1 2 1 3 1 4 16 5 32 6 64 7 128 8 256 9 512 10 1024 11 177147 12 531441 13 1594323 14 4782969 15 14348907 16 43046721 17 129140163 18 387420489 19 1162261467 20 3486784401 21 10460353203 22 31381059609 23 94143178827 24 282429536481 25 847288609443