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 A367775 #6 Dec 02 2023 06:16:31
%S A367775 1,1,4,7,37,94,587,1925,13606,54217,424381,1979704,16918869,90086877,
%T A367775 831972372,4964577987,49154794969,324183365662,3419501188439,
%U A367775 24655458609377,275624716500750,2153735319395661,25406228456463665,213606545948092304,2649077873736448473
%N A367775 a(n) = Sum_{k=0..n} (-1)^(n - k) * A011971(n, k).
%C A367775 Alternating row sums of the Peirce/Aitken/Bell triangle A011971.
%o A367775 (Python) # Using the function b from A367808.
%o A367775 def a(n): return sum(b(n)[k] * (-1)**(n - k) for k in range(n + 1))
%o A367775 print([a(n) for n in range(25)])
%Y A367775 Cf. A011971, A005493, A367808, A367809.
%K A367775 nonn
%O A367775 0,3
%A A367775 _Peter Luschny_, Dec 02 2023