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 A185258 #11 Dec 28 2024 22:14:04 %S A185258 3,11,25,20,56,73,51,42,49,183,117,406,532,602,356,325,842,144,164, %T A185258 900,119,1406,1630,1011,1156,935,2050,2000,2222,2541,1690,2488,1981, %U A185258 3699,1308,2924,4371,897,311,5113,5735,3783,5549,1807,696,5654,6478 %N A185258 A185253(n) is the a(n)-th triangular number. %C A185258 See A185128 for further information. %D A185258 Albert H. Beiler, Recreations in the theory of numbers, New York, Dover, (2nd ed.) 1966, p. 197, no. 8. %H A185258 N. J. A. Sloane, <a href="/A185128/a185128.jpg">Annotated scan of Beiler's Table 81</a>, based on page 197 of Beiler's "Recreations in the Theory of Numbers: The Queen of Mathematics Entertains", New York, Dover, First ed., 1964. %Y A185258 Cf. A000217, A185128, A185129, A185223, A185233, A185243, A185253, A185257. %K A185258 nonn %O A185258 1,1 %A A185258 _Martin Renner_, Jan 20 2012 %E A185258 Edited (with a simpler definition) by _N. J. A. Sloane_, Dec 28 2024