Number of length-n binary words w such that ww is rich.

Terms

a(0) =2a(1) =4a(2) =8a(3) =16a(4) =32a(5) =52a(6) =100a(7) =160a(8) =260a(9) =424a(10) =684a(11) =988a(12) =1588a(13) =2342a(14) =3458a(15) =5072a(16) =7516a(17) =10546a(18) =15506a(19) =21496a(20) =30682a(21) =42508a(22) =60170a(23) =81316a(24) =114182a(25) =153768a(26) =212966a(27) =283502a(28) =390168a(29) =513652