Central terms of the rows of triangle A115323.

Terms

a(0) =1a(1) =1a(2) =2a(3) =4a(4) =9a(5) =22a(6) =55a(7) =141a(8) =371a(9) =997a(10) =2712a(11) =7440a(12) =20542a(13) =57056a(14) =159343a(15) =447045a(16) =1259443a(17) =3561529a(18) =10119910a(19) =28892841a(20) =82727805a(21) =237322575a(22) =681862156a(23) =1961930899a(24) =5653182325a(25) =16312268162a(26) =47133250093a(27) =136366337701