# A102307 (b-file synthesized from sequence entry) 0 1 1 4 2 30 3 260 4 2380 5 22428 6 215292 7 2093520 8 20553390 9 203280220 10 2022339176 11 20215564824 12 202879303900 13 2042865050800 14 20629119101400 15 208829908532880 16 2118554718825420 17 21533269718832300 18 219235457827640100 19 2235446059461106800 20 22824647678376163620 21 233331794241184490280