# A014280 (b-file synthesized from sequence entry) 0 0 1 1 2 1 3 2 4 3 5 6 6 12 7 28 8 64 9 152 10 363 11 883 12 2165 13 5375 14 13439 15 33885 16 85960 17 219398 18 562768 19 1450356 20 3753054 21 9748390 22 25406262 23 66419263 24 174128256 25 457690900 26 1205900244 27 3184274398 28 8425557609 29 22336457078 30 59319973057