Partial sums of A057429.

Terms

a(0) =2a(1) =5a(2) =10a(3) =17a(4) =28a(5) =47a(6) =76a(7) =123a(8) =196a(9) =275a(10) =388a(11) =539a(12) =696a(13) =859a(14) =1026a(15) =1265a(16) =1506a(17) =1789a(18) =2142a(19) =2509a(20) =2888a(21) =3345a(22) =4342a(23) =5709a(24) =8750a(25) =18891a(26) =33590a(27) =61119a(28) =110326a(29) =187617