The sequence denoted by p_n used in the calculation of A323260.

Terms

a(0) =0a(1) =2a(2) =6a(3) =26a(4) =102a(5) =416a(6) =1684a(7) =6838a(8) =27746a(9) =112606a(10) =456974a(11) =1854504a(12) =7525952a(13) =30541874a(14) =123945206a(15) =502995202a(16) =2041258182a(17) =8283846440a(18) =33617556212a(19) =136426972038a(20) =553648771426