a(n) = Sum_{k=1..n} A145518(n,k).

Terms

a(0) =1a(1) =2a(2) =7a(3) =19a(4) =54a(5) =134a(6) =354a(7) =838a(8) =2057a(9) =4794a(10) =11232a(11) =25412a(12) =58075a(13) =128670a(14) =286152a(15) =625829a(16) =1365653a(17) =2941088a(18) =6331146a(19) =13474533a(20) =28642325a(21) =60404681a(22) =127082128a(23) =265712673a(24) =554608226a(25) =1151374963a(26) =2385950536a(27) =4924685252a(28) =10145267212a(29) =20831428273