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 A128443 #12 Aug 31 2021 04:38:22 %S A128443 1,6,15,36,77,162,327,648,1262,2430,4629,8748,16414,30618,56819, %T A128443 104976,193187,354294,647747,1180980,2147793,3897234,7057034,12754584, %U A128443 23012070,41452398,74559107,133923132,240246014,430467210,770444114,1377495072 %N A128443 a(n) = floor(n*3^(n/2)). %F A128443 a(n) = A128444(n,n). %p A128443 seq(floor(evalf(n*3^(n/2))), n=1..32); # _Georg Fischer_, Aug 31 2021 %o A128443 (PARI) a(n) = sqrtint(n^2*3^n); \\ _Michel Marcus_, Aug 31 2021 %Y A128443 Cf. A128444. %K A128443 nonn,easy %O A128443 1,2 %A A128443 _Clark Kimberling_, Mar 03 2007 %E A128443 a(24) and more terms corrected by _Georg Fischer_, Aug 31 2021