# A049968 (b-file synthesized from sequence entry) 1 1 2 3 3 2 4 7 5 15 6 29 7 59 8 131 9 306 10 554 11 1109 12 2231 13 4506 14 9259 15 19321 16 42039 17 98893 18 178466 19 356933 20 713879 21 1427802 22 2855851 23 5712505 24 11428407 25 22871629 26 45822830 27 91903700 28 184878269 29 374041241 30 765241606 31 1599515283