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 A278559 #18 Jul 31 2021 13:25:44 %S A278559 1575,173525,7089500,169229875,2841940500,37027355200,397125074750, %T A278559 3646072432125,29454549941750,213636919820625,1412749565173450, %U A278559 8620496275465025,49005643635237875,261578907351144125,1319510599727473500,6324621482504294325,28938037257084798150 %N A278559 a(n) = A000041(25*n + 24). %H A278559 Seiichi Manyama, <a href="/A278559/b278559.txt">Table of n, a(n) for n = 0..10000</a> %F A278559 a(n) = A213260(5*n + 4) = A000041(25*n + 24). %F A278559 a(n) = 5^2*63*A160460(n) + 5^5*52*A278555(n-1) + 5^7*63*A278556(n-2) + 5^10*6*A278557(n-3) + 5^12*A278558(n-4) for n >= 4. %e A278559 a(4) = 5^2*63*A160460(4) + 5^5*52*A278555(3) + 5^7*63*A278556(2) + 5^10*6*A278557(1) + 5^12*A278558(0) = 771750 + 103512500 + 1028671875 + 1464843750 + 244140625 = 2841940500. %Y A278559 Cf. A000041, A160460, A213260, A278555, A278556, A278557, A278558. %K A278559 nonn %O A278559 0,1 %A A278559 _Seiichi Manyama_, Nov 23 2016