# A148473 (b-file synthesized from sequence entry) 0 1 1 1 2 2 3 6 4 20 5 65 6 226 7 838 8 3201 9 12386 10 48948 11 197608 12 809096 13 3345155 14 13980334 15 59041103 16 251334992 17 1076995274 18 4645807488 19 20164588874 20 87973297367 21 385580488738 22 1697545399851 23 7504250584691 24 33293669209338 25 148208341418642 26 661867001127396 27 2964446051683526 28 13313133410772356