a(n) = A273059(4n+2).

Terms

a(0) =13a(1) =92a(2) =244a(3) =467a(4) =656a(5) =999a(6) =1415a(7) =1902a(8) =2461a(9) =3093a(10) =3796a(11) =4305a(12) =5128a(13) =6024a(14) =6991a(15) =8031a(16) =9142a(17) =9923a(18) =11154a(19) =12458a(20) =13833a(21) =15280a(22) =16800a(23) =18391a(24) =19492a(25) =21203a(26) =22987a(27) =24842a(28) =26119a(29) =28094