(A209982)/2.

Terms

a(0) =0a(1) =10a(2) =26a(3) =58a(4) =90a(5) =154a(6) =186a(7) =282a(8) =346a(9) =442a(10) =506a(11) =666a(12) =730a(13) =922a(14) =1018a(15) =1146a(16) =1274a(17) =1530a(18) =1626a(19) =1914a(20) =2042a(21) =2234a(22) =2394a(23) =2746a(24) =2874a(25) =3194a(26) =3386a(27) =3674a(28) =3866a(29) =4314