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 A102477 #12 Mar 11 2019 10:56:36 %S A102477 1,2,4,6,10,18,32,55,98,173,307,543,962,1705,3021,5354,9489,16818, %T A102477 29810,52836,93649,165987,294205,521464,924270,1638225,2903678, %U A102477 5146634,9122172,16168628,28658146,50795242,90032221,159577957,282844564,501328936,888582404 %N A102477 a(n) = ceiling(Pi^(n/2)). %t A102477 Ceiling[Pi^(Range[0,40]/2)] (* _Harvey P. Dale_, May 28 2015 *) %Y A102477 Cf. A000796, A102475. %K A102477 nonn %O A102477 0,2 %A A102477 Jun Mizuki (suzuki32(AT)sanken.osaka-u.ac.jp), Feb 24 2005 %E A102477 a(0)=1 prepended by _Alois P. Heinz_, Feb 27 2019