# A069229 (b-file synthesized from sequence entry) 0 0 1 3 2 10 3 27 4 68 5 165 6 390 7 903 8 2056 9 4617 10 10250 11 22539 12 49164 13 106509 14 229390 15 491535 16 1048592 17 2228241 18 4718610 19 9961491 20 20971540 21 44040213 22 92274710 23 192938007 24 402653208 25 838860825 26 1744830490 27 3623878683 28 7516192796