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 A178870 #11 Jul 22 2025 08:16:33 %S A178870 1,10,-1,100,-30,1,1000,-500,50,-1,10000,-7000,1300,-70,1,100000, %T A178870 -90000,25000,-2500,90,-1,1000000,-1100000,410000,-63000,4100,-110,1, %U A178870 10000000,-13000000,6100000,-1290000,129000,-6100,130,-1 %N A178870 Signed Delannoy triangle convolved with 10^n. %C A178870 Row sums give A178869 %F A178870 T(n,k) = A008288(n,k)*(-10)^(n-k)*(-1)^n, A008288 seen as a triangle read by rows. - _Philippe Deléham_, Feb 27 2013 %e A178870 Triangle begins: %e A178870 1 %e A178870 10, -1 %e A178870 100, -30, 1 %e A178870 1000, -500, 50, -1 %e A178870 10000, -7000, 1300, -70, 1 %e A178870 100000, -90000, 25000, -2500, 90, -1 %e A178870 1000000, -1100000, 410000, -63000, 4100, -110, 1 %e A178870 10000000, -13000000, 6100000, -1290000, 129000, -6100, 130, -1 %Y A178870 Cf. A008288, A165293, A178865, A178869 %K A178870 sign,tabl %O A178870 0,2 %A A178870 _Mark Dols_, Jun 20 2010 %E A178870 More terms from _Philippe Deléham_, Feb 27 2013