# A150244 (b-file synthesized from sequence entry) 0 1 1 2 2 6 3 22 4 84 5 334 6 1374 7 5778 8 24688 9 106577 10 465490 11 2050238 12 9083750 13 40512563 14 181633610 15 817664224 16 3696090185 17 16767288215 18 76293756214 19 348129688283 20 1592645474737 21 7302821254661 22 33555980562246 23 154490994132251 24 712544695144962 25 3291770609667446 26 15230615144016301 27 70570905651026824