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 A233530 #8 Dec 11 2013 23:27:36
%S A233530 1,1,1,0,2,1,0,3,3,1,0,8,9,4,1,0,38,40,18,5,1,0,268,264,112,30,6,1,0,
%T A233530 2578,2379,953,240,45,7,1,0,31672,27568,10500,2505,440,63,8,1,0,
%U A233530 475120,392895,143308,32686,5445,728,84,9,1,0,8427696,6663624,2342284,514660,82176,10423,1120,108,10,1,0,172607454,131211423,44677494,9514570,1467837,178689,18214,1632,135,11,1
%N A233530 Triangle, read by rows, that transforms diagonals in the table of coefficients in the successive iterations of the g.f. (A233531) such that column 0 consists of all zeros after row 1.
%e A233530 Triangle begins:
%e A233530 1;
%e A233530 1, 1;
%e A233530 0, 2, 1;
%e A233530 0, 3, 3, 1;
%e A233530 0, 8, 9, 4, 1;
%e A233530 0, 38, 40, 18, 5, 1;
%e A233530 0, 268, 264, 112, 30, 6, 1;
%e A233530 0, 2578, 2379, 953, 240, 45, 7, 1;
%e A233530 0, 31672, 27568, 10500, 2505, 440, 63, 8, 1;
%e A233530 0, 475120, 392895, 143308, 32686, 5445, 728, 84, 9, 1;
%e A233530 0, 8427696, 6663624, 2342284, 514660, 82176, 10423, 1120, 108, 10, 1;
%e A233530 0, 172607454, 131211423, 44677494, 9514570, 1467837, 178689, 18214, 1632, 135, 11, 1;
%e A233530 0, 4008441848, 2943137604, 974898636, 202185010, 30319020, 3572037, 349720, 29718, 2280, 165, 12, 1; ...
%e A233530 in which column 0 consists of all zeros after row 1.
%e A233530 ILLUSTRATION OF GENERATING METHOD.
%e A233530 The g.f. of A233531 begins:
%e A233530 G(x) = x + x^2 - 2*x^3 + 6*x^4 - 18*x^5 + 44*x^6 - 56*x^7 - 300*x^8 + 2024*x^9 - 22022*x^10 - 130456*x^11 - 4241064*x^12 - 103538532*x^13 - 2893308780*x^14 - 88314189664*x^15 - 2924814872208*x^16 - 104538530634844*x^17 - 4010605941377292*x^18 +...
%e A233530 If we form a table of coefficients in the iterations of G(x) like so:
%e A233530 [1, 0, 0, 0, 0, 0, 0, 0, 0, 0, ...];
%e A233530 [1, 1, -2, 6, -18, 44, -56, -300, 2024, -22022, ...];
%e A233530 [1, 2, -2, 3, 2, -48, 228, -734, -1298, -14630, ...];
%e A233530 [1, 3, 0, -3, 18, -54, -24, 625, -6324, -46064, ...];
%e A233530 [1, 4, 4, -6, 12, 26, -332, 244, -2078, -108754, ...];
%e A233530 [1, 5, 10, 0, -10, 90, -192, -2044, -3190, -137176, ...];
%e A233530 [1, 6, 18, 21, -18, 54, 312, -3178, -22032, -203692, ...];
%e A233530 [1, 7, 28, 63, 42, -28, 616, -931, -46722, -457746, ...];
%e A233530 [1, 8, 40, 132, 248, 156, 504, 3144, -51348, -913356, ...];
%e A233530 [1, 9, 54, 234, 702, 1296, 1656, 6924, -24444, -1366530, ...];
%e A233530 [1, 10, 70, 375, 1530, 4580, 9916, 22122, 38570, -1538042, ...];
%e A233530 [1, 11, 88, 561, 2882, 11814, 38280, 104929, 273592, -987932, ...];
%e A233530 [1, 12, 108, 798, 4932, 25542, 110604, 407932, 1351614, 2563858, ...]; ...
%e A233530 then this triangle T transforms one diagonal in the above table into another:
%e A233530 T*[1, 1, -2, -3, 12, 90, 312, -931, -51348, -1366530, ...]
%e A233530 = [1, 2, 0, -6, -10, 54, 616, 3144, -24444, -1538042, ...];
%e A233530 T*[1, 2, 0, -6, -10, 54, 616, 3144, -24444, -1538042, ...]
%e A233530 = [1, 3, 4, 0, -18,-28, 504, 6924, 38570, -987932, ...];
%e A233530 T*[1, 3, 4, 0, -18,-28, 504, 6924, 38570, -987932, ...]
%e A233530 = [1, 4,10, 21, 42,156,1656,22122, 273592, 2563858, ...].
%o A233530 (PARI) /* Given Root Series G, Calculate T(n,k) of Triangle: */
%o A233530 {T(n, k)=local(F=x, M, N, P, m=max(n, k)); M=matrix(m+2, m+2, r, c, F=x;
%o A233530 for(i=1, r+c-2, F=subst(F, x, G +x*O(x^(m+2)))); polcoeff(F, c));
%o A233530 N=matrix(m+1, m+1, r, c, M[r, c]);
%o A233530 P=matrix(m+1, m+1, r, c, M[r+1, c]); (P~*N~^-1)[n+1, k+1]}
%o A233530 /* Calculates Root Series G and then Prints ROWS of Triangle: */
%o A233530 {ROWS=12;V=[1,1];print("");print1("Root Sequence: [1, 1, ");
%o A233530 for(i=2,ROWS,V=concat(V,0);G=x*truncate(Ser(V));
%o A233530 for(n=0,#V-1,if(n==#V-1,V[#V]=-T(n,0));for(k=0,n, T(n,k)));print1(V[#V]", "););
%o A233530 print1("...]");print("");print("");print("Triangle begins:");
%o A233530 for(n=0,#V-2,for(k=0,n,print1(T(n,k),", "));print(""))}
%Y A233530 Cf. A233531, A233532, A233533, A233534, A233535 (row sums).
%K A233530 nonn,tabl
%O A233530 0,5
%A A233530 _Paul D. Hanna_, Dec 11 2013