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 A228689 #18 Nov 30 2022 07:50:08 %S A228689 1,28,992,16256,523264,69524373504,67100672,7767211311104, %T A228689 3014494287036416,2303837503821447168,341653284209033216, %U A228689 798366828940770681028608,11852230872517975212032,91678339751618435453288448,1986677733776616536315084668928,284423744326342962334231917756416 %N A228689 a(n) = A001676(4*n + 3). %H A228689 V. P. Snaith, <a href="http://www.ams.org/notices/201308/rnoti-p1040.pdf">A history of the Arf-Kervaire invariant problem</a>, Notices Amer. Math. Soc., 60 (No. 8, 2013), 1040-1047. %Y A228689 Cf. A001676, A228690, A228691, A228692, A189995. %K A228689 nonn %O A228689 0,2 %A A228689 _N. J. A. Sloane_, Aug 30 2013 %E A228689 Term a(15) corrected by _Andrey Zabolotskiy_, Nov 27 2022