First differences of A052829.

Terms

a(0) =1a(1) =1a(2) =2a(3) =6a(4) =15a(5) =44a(6) =128a(7) =386a(8) =1179a(9) =3679a(10) =11601a(11) =37030a(12) =119262a(13) =387325a(14) =1266647a(15) =4168264a(16) =13791565a(17) =45856091a(18) =153134306a(19) =513403575a(20) =1727395042a(21) =5830866601a(22) =19740613869a(23) =67014421326a(24) =228066659185a(25) =777961702283