This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A290437 #7 Aug 28 2017 01:02:13 %S A290437 1,2,4,4,13,18,40,71,132,231,459,990,2114,4237,8234,16054,31280,60252, %T A290437 115810 %N A290437 a(n) = A289676(3*n+2). %C A290437 No formulas or recurrences are known for the important sequences A289670 and A289671. The essence of these two sequences is captured in the six entries A290436-A290441. Any numerical properties of these would be most welcome. %Y A290437 Cf. A284116, A284119, A284121, A289670-A289677, A290436-A290441. %K A290437 nonn,more %O A290437 0,2 %A A290437 _N. J. A. Sloane_, Aug 02 2017