# A056331 (b-file synthesized from sequence entry) 1 1 2 1 3 2 4 4 5 9 6 16 7 35 8 66 9 133 10 261 11 527 12 1032 13 2079 14 4123 15 8244 16 16440 17 32895 18 65639 19 131327 20 262380 21 524762 22 1049071 23 2098175 24 4195230 25 8390646 26 16779231 27 33558392 28 67112892 29 134225919 30 268443306