# A126220 (b-file synthesized from sequence entry) 0 1 1 2 2 5 3 14 4 40 5 116 6 344 7 1040 8 3188 9 9880 10 30912 11 97520 12 309856 13 990656 14 3184672 15 10287808 16 33379072 17 108724864 18 355405568 19 1165521408 20 3833497408 21 12642775424 22 41799227392 23 138512751360 24 459973953024 25 1530498526208