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 A146952 #6 Jan 03 2020 21:16:30
%S A146952 0,3,6,12,17,26,33,45,54,69,80,2,111,132,3,171,188,215,234,264,285,
%T A146952 318,341,377,402,9,468,510,11,584,615,663,696,747,782,836,873,930,969,
%U A146952 3,1070,1133,24,1242,1287,1356,1403,1475,1524,1599,1650,1728,1781,38
%N A146952 a(n) = A146950(n)/40.
%C A146952 A061047(n) is divisible by 10 iff n is 3 or 7 mod 10. In this case, A061047(n) is also divisible by 40. - _Andrew Howroyd_, Jan 03 2020
%H A146952 Andrew Howroyd, <a href="/A146952/b146952.txt">Table of n, a(n) for n = 1..1000</a>
%F A146952 a(n) = A061047(5*n + 3 - (n mod 2)). - _Andrew Howroyd_, Jan 03 2020
%o A146952 (PARI) a(n)={my(t=5*n + 3 - n%2); numerator(1/49 - 1/t^2)/40} \\ _Andrew Howroyd_, Jan 03 2020
%Y A146952 Cf. A061047, A146950.
%K A146952 nonn
%O A146952 1,2
%A A146952 _Paul Curtz_, Nov 03 2008
%E A146952 Offset corrected and terms a(11) and beyond from _Andrew Howroyd_, Jan 03 2020