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 A098545 #14 Mar 28 2020 05:19:07
%S A098545 1,3,7,21,51,148,365,983,2461,6360,15687,39757,97033,240425,582622,
%T A098545 1421273,3409861,8222920,19565707,46680362,110309476,260876036,
%U A098545 612293443,1437616751,3354111156,7823501148,18157700800,42112132458
%N A098545 Row sums of A098546.
%C A098545 By using multisets (cf. A001700) and multinomials (cf. A005651); A035206 and A036038 were used to generate A049009 (Words over signatures). A098346 and A049019 provide another approach to the same end (compare A090657).
%F A098545 a(n) = Sum_{k=1..n} binomial(n, k)*A008284(n, k). - _Vladeta Jovovic_, Jul 24 2005
%e A098545 A098546 begins
%e A098545 1
%e A098545 1 2
%e A098545 1 3 3
%e A098545 1 4 6 6 4
%e A098545 so sequence begins 1 3 7 21 ...
%Y A098545 Cf. A000041, A000312.
%K A098545 easy,nonn
%O A098545 1,2
%A A098545 _Alford Arnold_, Sep 14 2004
%E A098545 More terms from _Vladeta Jovovic_, Jul 24 2005