Partial sums of A048693.

Terms

a(0) =1a(1) =7a(2) =20a(3) =52a(4) =129a(5) =315a(6) =764a(7) =1848a(8) =4465a(9) =10783a(10) =26036a(11) =62860a(12) =151761a(13) =366387a(14) =884540a(15) =2135472a(16) =5155489a(17) =12446455a(18) =30048404a(19) =72543268a(20) =175134945a(21) =422813163a(22) =1020761276a(23) =2464335720a(24) =5949432721a(25) =14363201167a(26) =34675835060a(27) =83714871292a(28) =202105577649a(29) =487926026595