# A148555 (b-file synthesized from sequence entry) 0 1 1 1 2 3 3 6 4 18 5 47 6 141 7 432 8 1329 9 4452 10 14295 11 49817 12 167179 13 591475 14 2062501 15 7357786 16 26446105 17 95239479 18 349688079 19 1274422929 20 4742103229 21 17511528513 22 65687166495 23 245724681207 24 926977717315 25 3507504480858 26 13301679890417 27 50792123226168 28 193720256273361 29 744703358194793 30 2857772882473509