# A205498 (b-file synthesized from sequence entry) 0 1 1 1 2 2 3 5 4 16 5 63 6 329 7 2291 8 21986 9 293295 10 5493212 11 145199609 12 5435890215 13 288986265721 14 21854960540507 15 2354333160724935 16 361635116847622331 17 79267245693976433777 18 24809117584333459025386 19 11092978451251892467436829 20 7089163369051891054753027252