# A127713 (b-file synthesized from sequence entry) 0 1 1 2 2 4 3 10 4 23 5 59 6 149 7 387 8 1000 9 2607 10 6799 11 17770 12 46457 13 121542 14 318044 15 832427 16 2178919 17 5703887 18 14931949 19 39090776 20 102338336 21 267921095 22 701419679 23 1836329673 24 4807555633 25 12586315482