# A035508 (b-file synthesized from sequence entry) 0 0 1 2 2 7 3 20 4 54 5 143 6 376 7 986 8 2583 9 6764 10 17710 11 46367 12 121392 13 317810 14 832039 15 2178308 16 5702886 17 14930351 18 39088168 19 102334154 20 267914295 21 701408732 22 1836311902 23 4807526975 24 12586269024 25 32951280098 26 86267571271 27 225851433716