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%I #14 Mar 28 2020 05:19:07
%S 1,3,7,21,51,148,365,983,2461,6360,15687,39757,97033,240425,582622,
%T 1421273,3409861,8222920,19565707,46680362,110309476,260876036,
%U 612293443,1437616751,3354111156,7823501148,18157700800,42112132458
%N Row sums of A098546.
%C 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 a(n) = Sum_{k=1..n} binomial(n, k)*A008284(n, k). - _Vladeta Jovovic_, Jul 24 2005
%e A098546 begins
%e 1
%e 1 2
%e 1 3 3
%e 1 4 6 6 4
%e so sequence begins 1 3 7 21 ...
%Y Cf. A000041, A000312.
%K easy,nonn
%O 1,2
%A _Alford Arnold_, Sep 14 2004
%E More terms from _Vladeta Jovovic_, Jul 24 2005
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