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 A290441 #7 Aug 28 2017 01:02:52 %S A290441 1,3,5,13,20,44,89,192,396,814,1610,3130,6103,12229,24736,49879, %T A290441 100747,203765,411403 %N A290441 a(n) = A289677(3*n). %C A290441 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 A290441 Cf. A284116, A284119, A284121, A289670-A289677, A290436-A290441. %K A290441 nonn,more %O A290441 1,2 %A A290441 _N. J. A. Sloane_, Aug 02 2017