# A148281 (b-file synthesized from sequence entry) 0 1 1 1 2 2 3 5 4 12 5 32 6 92 7 261 8 772 9 2372 10 7238 11 22596 12 72206 13 229686 14 741392 15 2431669 16 7948084 17 26247900 18 87708782 19 292258192 20 981394918 21 3325723982 22 11242917210 23 38238313052 24 131010982918 25 447908510662 26 1538854377302 27 5319179650346 28 18350798477954 29 63566944432482 30 221330181884312 31 769277947501077