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 A260780 #20 Feb 03 2025 12:05:27 %S A260780 1,3,-1,23,-16,5,165,-177,111,-27,3802,-5548,5232,-2548,502,21385, %T A260780 -39615,49910,-36490,14385,-2375,993605,-2235440,3527745,-3441280, %U A260780 2035695,-672360,95435 %N A260780 Triangle read by rows: coefficients for predictor y(x_1) for step-by-step integration. %H A260780 W. F. Pickard, <a href="https://doi.org/10.1145/321217.321226">Tables for the step-by-step integration of ordinary differential equations of the first order</a>, J. ACM 11 (1964), 229-233. %H A260780 W. F. Pickard, <a href="/A002397/a002397.pdf">Tables for the step-by-step integration of ordinary differential equations of the first order</a>, J. ACM 11 (1964), 229-233. [Annotated scanned copy] See Table II. %e A260780 Triangle begins: %e A260780 1; %e A260780 3, -1; %e A260780 23, -16, 5; %e A260780 165, -177, 111, -27; %e A260780 3802, -5548, 5232, -2548, 502; %e A260780 ... %Y A260780 Row sums = A002397. %Y A260780 Diagonals (up to signs in some cases) include A002398, A002399, A002400, A002401, A002404. %Y A260780 The following sequences are taken from page 231 of Pickard (1964): A002397, A002398, A002399, A002400, A002401, A002402, A002403, A002404, A002405, A002406, A260780, A260781. %K A260780 sign,tabl,more %O A260780 0,2 %A A260780 _N. J. A. Sloane_, Aug 02 2015 %E A260780 a(15)-a(27) from _Robert Price_, Sep 09 2019