a(n) = Sum_{i=0..n} A047130(i, n-i).

Terms

a(0) =1a(1) =2a(2) =3a(3) =6a(4) =10a(5) =20a(6) =35a(7) =70a(8) =140a(9) =252a(10) =504a(11) =932a(12) =1864a(13) =3493a(14) =6986a(15) =13972a(16) =26265a(17) =52530a(18) =100168a(19) =200336a(20) =384573a(21) =769146a(22) =1538292a(23) =2950530a(24) =5901060a(25) =11422700a(26) =22845400a(27) =44403564a(28) =88807128a(29) =177614256