a(n) = A338268(k^2 + 2*n, k) for sufficiently large k.

Terms

a(0) =2a(1) =2a(2) =2a(3) =4a(4) =6a(5) =8a(6) =14a(7) =20a(8) =28a(9) =44a(10) =68a(11) =98a(12) =148a(13) =224a(14) =332a(15) =500a(16) =754a(17) =1122a(18) =1682a(19) =2530a(20) =3786a(21) =5674a(22) =8514a(23) =12752a(24) =19112a(25) =28668a(26) =42962a(27) =64386a(28) =96538a(29) =144702