# A023597 (b-file synthesized from sequence entry) 1 1 2 3 3 5 4 11 5 18 6 30 7 51 8 84 9 137 10 222 11 362 12 587 13 952 14 1541 15 2494 16 4038 17 6535 18 10576 19 17114 20 27692 21 44807 22 72502 23 117312 24 189817 25 307132 26 496952 27 804086 28 1301039 29 2105128 30 3406170 31 5511301 32 8917474