# A143581 (b-file synthesized from sequence entry) 1 2 2 1 3 3 4 5 5 35 6 63 7 231 8 143 9 6435 10 12155 11 46189 12 88179 13 676039 14 1300075 15 5014575 16 9694845 17 100180065 18 116680311 19 2268783825 20 1472719325 21 34461632205 22 67282234305 23 17534158031 24 514589420475 25 8061900920775 26 5267108601573