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

Terms

a(0) =0a(1) =0a(2) =0a(3) =1a(4) =5a(5) =19a(6) =82a(7) =324a(8) =1328a(9) =5367a(10) =21809a(11) =88463a(12) =359056a(13) =1457052a(14) =5913112a(15) =23996513a(16) =97382945a(17) =395199883a(18) =1603802802a(19) =6508562056a(20) =26413086624a(21) =107189749111a(22) =434998095205