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 A102475 #13 Mar 11 2019 10:57:21 %S A102475 1,1,3,5,9,17,31,54,97,172,306,542,961,1704,3020,5353,9488,16817, %T A102475 29809,52835,93648,165986,294204,521463,924269,1638224,2903677, %U A102475 5146633,9122171,16168627,28658145,50795241,90032220,159577956,282844563,501328935,888582403 %N A102475 a(n) = floor(Pi^(n/2)). %t A102475 Floor[Pi^(Range[0,40]/2)] (* _Harvey P. Dale_, Aug 27 2012 *) %Y A102475 Cf. A000796, A102477. %K A102475 nonn %O A102475 0,3 %A A102475 Jun Mizuki (suzuki32(AT)sanken.osaka-u.ac.jp), Feb 24 2005 %E A102475 a(0)=1 prepended by _Alois P. Heinz_, Feb 27 2019