a(n) = Sum_{k=0..n} 2^k*C([(n+k)/2],k)*C([(n+k+1)/2],k) where [x]=floor(x).

A124431

a(n) = Sum_{k=0..n} 2^k*C([(n+k)/2],k)*C([(n+k+1)/2],k) where [x]=floor(x).

Terms

    a(0) =1a(1) =3a(2) =9a(3) =29a(4) =97a(5) =331a(6) =1145a(7) =4001a(8) =14089a(9) =49915a(10) =177713a(11) =635293a(12) =2278841a(13) =8198227a(14) =29567729a(15) =106872961a(16) =387038993a(17) =1404052659a(18) =5101219929a(19) =18559193245a(20) =67605310097a(21) =246541193883a(22) =899999057385

External references