# A153986 (b-file synthesized from sequence entry) 0 1 1 1 2 2 3 2 4 2 5 4 6 9 7 15 8 37 9 88 10 191 11 729 12 2246 13 6555 14 31434 15 144150 16 601688 17 3970089 18 24322158 19 135488789 20 1251604698 21 10410417129 22 79632436378 23 997602199170 24 11483571472544 25 120898733308159 26 2073714604283068 27 32605974669636948