a(n) = A273059(4n+1).

Terms

a(0) =9a(1) =82a(2) =228a(3) =445a(4) =630a(5) =967a(6) =1377a(7) =1858a(8) =2411a(9) =3037a(10) =3734a(11) =4239a(12) =5056a(13) =5946a(14) =6907a(15) =7941a(16) =9046a(17) =9823a(18) =11048a(19) =12346a(20) =13715a(21) =15156a(22) =16670a(23) =18255a(24) =19352a(25) =21057a(26) =22835a(27) =24684a(28) =25957a(29) =27926