Partial sums of A048697.

Terms

a(0) =1a(1) =11a(2) =32a(3) =84a(4) =209a(5) =511a(6) =1240a(7) =3000a(8) =7249a(9) =17507a(10) =42272a(11) =102060a(12) =246401a(13) =594871a(14) =1436152a(15) =3467184a(16) =8370529a(17) =20208251a(18) =48787040a(19) =117782340a(20) =284351729a(21) =686485807a(22) =1657323352a(23) =4001132520a(24) =9659588401a(25) =23320309331a(26) =56300207072a(27) =135920723484a(28) =328141654049