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 A055106 #7 Mar 12 2022 22:45:05 %S A055106 1,1,1,1,4,1,1,12,8,1,1,33,44,13,1,1,88,208,109,19,1,1,232,910,753, %T A055106 223,26,1,1,609,3809,4674,2091,405,34,1,1,1596,15521,27161,17220,4926, %U A055106 677,43,1,1,4180,62185,151134,130480,51702,10342,1064,53,1 %N A055106 Triangle T(n,k) giving number of symmetric polynomials of degree n in k noncommuting variables, n >=2, 2 <= k <= n. %C A055106 A055105 with first column deleted. - _Sean A. Irvine_, Mar 12 2022 %D A055106 M. C. Wolf, Symmetric Functions of Non-commutative Elements, Duke Math. J., 2 (1936), 626-637. %e A055106 T(1,1)=1 from Sum x_1; T(2,2)=1 from Sum x_1 x_2; T(3,2)=1 from Sum x_1 x_2 x_1; T(3,3)=1 from Sum x_1 x_2 x_3; ... %e A055106 1; 1,1; 1,4,1; 1,12,8,1; 1,33,44,13,1; ... %Y A055106 Row sums are A074664. Cf. A055105, A055107. %K A055106 nonn,tabl,nice %O A055106 2,5 %A A055106 _N. J. A. Sloane_, Jun 14 2000 %E A055106 More terms from _Sean A. Irvine_, Mar 12 2022