# A148333 (b-file synthesized from sequence entry) 0 1 1 1 2 2 3 5 4 14 5 43 6 145 7 511 8 1878 9 7151 10 27975 11 111870 12 456021 13 1889917 14 7940790 15 33772677 16 145191428 17 630092620 18 2757388326 19 12157863845 20 53970276037 21 241044107881 22 1082536970720 23 4886346484996 24 22158022408605 25 100906064806922 26 461316918159512 27 2116643861301808 28 9744189217604779