Invert transform of A037952.

Terms

a(0) =1a(1) =1a(2) =2a(3) =6a(4) =15a(5) =41a(6) =107a(7) =287a(8) =758a(9) =2022a(10) =5362a(11) =14276a(12) =37916a(13) =100874a(14) =268084a(15) =713006a(16) =1895415a(17) =5040433a(18) =13400863a(19) =35634419a(20) =94745705a(21) =251932417a(22) =669862581a(23) =1781165785a(24) =4736000199a(25) =12592950131a(26) =33484024019a(27) =89033206579a(28) =236735594539