Partials sums of A001694.

Terms

a(0) =1a(1) =5a(2) =13a(3) =22a(4) =38a(5) =63a(6) =90a(7) =122a(8) =158a(9) =207a(10) =271a(11) =343a(12) =424a(13) =524a(14) =632a(15) =753a(16) =878a(17) =1006a(18) =1150a(19) =1319a(20) =1515a(21) =1715a(22) =1931a(23) =2156a(24) =2399a(25) =2655a(26) =2943a(27) =3232a(28) =3556a(29) =3899