# A005683 (b-file synthesized from sequence entry) 3 1 4 2 5 3 6 5 7 8 8 13 9 22 10 37 11 63 12 108 13 186 14 322 15 559 16 973 17 1697 18 2964 19 5183 20 9071 21 15886 22 27835 23 48790 24 85545 25 150021 26 263136 27 461596 28 809812 29 1420813 30 2492945 31 4374273 32 7675598 33 13468787 34 23634817 35 41474548 36 72780553 37 127718046 38 224125677 39 393308019 40 690200668