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 A290436 #7 Aug 28 2017 01:01:58 %S A290436 2,2,4,5,10,21,43,85,146,250,462,960,2069,4296,8485,16496,32041,61700, %T A290436 118357 %N A290436 a(n) = A289676(3*n+1). %C A290436 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 A290436 Cf. A284116, A284119, A284121, A289670-A289677, A290436-A290441. %K A290436 nonn,more %O A290436 0,1 %A A290436 _N. J. A. Sloane_, Aug 02 2017