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 A094616 #10 Nov 05 2020 05:30:18 %S A094616 1,8,35,126,417,1324,4111,12602,38333,116040,350187,1054678,3172249, %T A094616 9533156,28632263,85962354,258018165,774316672,2323474339,6971471630, %U A094616 20916512081,62753730588,188269580415,564825518506,1694510109997 %N A094616 Row sums of A094615. %F A094616 a(n) = 2(a(n-1)+3^n)+n-1, a(0)=1. %F A094616 a(n) = 2*3^(n+1)-2^(n+2)-n-1. - _Benoit Cloitre_, May 23 2004 %o A094616 (PARI) a(n)=2*3^(n+1)-2^(n+2)-n-1 %Y A094616 Cf. A094615. %K A094616 nonn %O A094616 0,2 %A A094616 _Clark Kimberling_, May 14 2004