# A027009 (b-file synthesized from sequence entry) 1 1 2 1 3 9 4 14 5 46 6 81 7 209 8 389 9 901 10 1726 11 3774 12 7349 13 15541 14 30561 15 63329 16 125294 17 256366 18 509161 19 1033449 20 2057549 21 4154701 22 8284926 23 16673534 24 33282989 25 66837421 26 133507081 27 267724809 28 535010414 29 1071881326 30 2142612801