# A124715 (b-file synthesized from sequence entry) 0 1 1 22 2 64 3 148 4 396 5 1052 6 2878 7 7946 8 22180 9 62356 10 176394 11 501446 12 1431426 13 4100482 14 11781736 15 33940508 16 97999060 17 283533332 18 821804362 19 2385796886 20 6936333286 21 20192890166 22 58855587316 23 171732657416 24 501596968522