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 A098975 #9 Aug 30 2024 10:19:06
%S A098975 1,1,1,1,1,2,1,3,3,1,2,6,4,1,1,7,10,5,1,6,16,15,6,1,3,19,30,21,7,1,1,
%T A098975 16,45,50,28,8,1,10,51,90,77,36,9,1,4,45,126,161,112,45,10,1,1,30,141,
%U A098975 266,266
%N A098975 Nonzero elements of table A071675; also counts selected ordered multisets of the values {1,2,3}.
%e A098975 Shift A027907 as indicated and construct a(n) by column.
%e A098975 The table begins
%e A098975 1
%e A098975 . 1 1 1
%e A098975 . . 1 2 3 2 1
%e A098975 . . . 1 3 6 7 6 3 1
%e A098975 . . . . 1 4 10 16 19 16 10 4 1
%e A098975 . . . . . 1 5 15 30 45 51 45 30 15 5 1
%e A098975 . . . . . . 1
%e A098975 therefore a(19) = 6 and appears in column seven and row three.
%e A098975 a(19) counts the ordered multisets {133,313,331,223,232,322}.
%Y A098975 Cf. A000073, A027907, A071675, A098925.
%K A098975 nonn,tabf
%O A098975 0,6
%A A098975 _Alford Arnold_, Oct 23 2004