# A148943 (b-file synthesized from sequence entry) 0 1 1 1 2 3 3 9 4 29 5 103 6 367 7 1337 8 5023 9 18933 10 72019 11 277595 12 1072317 13 4161419 14 16257277 15 63604357 16 249494725 17 982307399 18 3871371275 19 15281854703 20 60457884995 21 239348796175 22 948543450125 23 3764377613819 24 14946670066195 25 59387715592641 26 236183780014071 27 939637420512623 28 3740066423029775