Erroneous version of A275649.

Terms

a(0) =2a(1) =14a(2) =112a(3) =997a(4) =8982a(5) =82305a(6) =746092a(7) =7159654a(8) =67581778a(9) =641696858a(10) =6112456540a(11) =58649349743