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 A262673 #10 Oct 04 2015 04:46:34 %S A262673 1,3,34,615,15410,494018 %N A262673 Number of pointed trees on normal pointed multisets of weight n. %C A262673 A pointed multiset is normal if its entries span an initial interval of positive integers. %e A262673 The a(2) = 3 pointed trees are 1[1 1], 1[1 2], 2[1 2]. %e A262673 The a(3) = 34 pointed trees of the form rootpoint[pointedbranch ... pointedbranch] are: %e A262673 1[1 1[1 1]], 1[1[1 1] 1], 1[1 1 1], %e A262673 1[1 2[2 2]], 1[1[1 2] 2], 1[1 2 2], %e A262673 2[1 2[2 2]], 2[1[1 2] 2], 2[2 2[1 2]], 2[2[1 2] 2], 2[1 2 2], %e A262673 1[1 1[1 2]], 1[1 2[1 2]], 1[1[1 1] 2], 1[1[1 2] 1], 1[1 1 2], %e A262673 2[1 2[1 2]], 2[1[1 1] 2], 2[1 1 2], %e A262673 1[1 2[2 3]], 1[1 3[2 3]], 1[1[1 2] 3], 1[1[1 3] 2], 1[1 2 3], %e A262673 2[1 2[2 3]], 2[1[1 3] 2], 2[2 3[1 3]], 2[2[1 2] 3], 2[1 2 3], %e A262673 3[1 3[2 3]], 3[1[1 2] 3], 3[2 3[1 3]], 3[2[1 2] 3], 3[1 2 3]. %Y A262673 Cf. A053492, A052894, A262671. %K A262673 nonn,more %O A262673 1,2 %A A262673 _Gus Wiseman_, Sep 26 2015