a(n) = term at position 2^n in A107957.

A107958

a(n) = term at position 2^n in A107957.

Terms

    a(0) =1a(1) =3a(2) =11a(3) =52a(4) =331a(5) =2949a(6) =38069a(7) =733817a(8) =21670554a(9) =1001901607a(10) =73852354365

External references