# A007223 (b-file synthesized from sequence entry) 2 1 3 2 4 8 5 24 6 85 7 286 8 1008 9 3536 10 12618 11 45220 12 163504 13 594320 14 2173197 15 7983990 16 29465440 17 109174560 18 405995326 19 1514797020 20 5669021488 21 21275014800 22 80047272578 23 301892460012 24 1141069157408 25 4321730134624 26 16399422757300