# A046973 (b-file synthesized from sequence entry) 1 2 2 17 3 43 4 89 5 593 6 2213 7 9277 8 39929 9 1336337 10 2986609 11 12136609 12 226981081 13 309601747141 14 576013438873664081 15 576013438873858481 16 4622463127346550949 17 43784599166913148633 18 43784599166913343033 19 43784599169860444073 20 43784605671499215833 21 1488418770664783966373