Sum of the numbers in row n of the array at A242365.

Terms

a(0) =1a(1) =2a(2) =4a(3) =11a(4) =27a(5) =70a(6) =185a(7) =499a(8) =1356a(9) =3695a(10) =10075a(11) =27482a(12) =74997a(13) =204751a(14) =559172a(15) =1527379a(16) =4172439a(17) =11398634a(18) =31140481a(19) =85075307a(20) =232426476a(21) =634995031a(22) =1734829379a(23) =4739627674a(24) =12948881373a(25) =35376966263a(26) =96651610708a(27) =264057013451a(28) =721417015071