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 A337650 #17 Jul 24 2025 10:51:06
%S A337650 1,4,642,12065248,53480547965190
%N A337650 Volume of the positive signed Birkhoff polytope BB_{+}(n).
%H A337650 Dylan Heuer and Jessica Striker, <a href="https://doi.org/10.1137/21M1417958">Partial Permutation and Alternating Sign Matrix Polytopes</a>, SIAM Journal on Discrete Mathematics, 36 (2022), 2863-2888; arXiv:<a href="https://arxiv.org/abs/2012.09901">2012.09901</a> [math.CO], 2020-2022. See the diagonal of the table in Fig. 1.
%H A337650 Florian Kohl, McCabe Olsen, and Raman Sanyal, <a href="https://arxiv.org/abs/1906.01469">Unconditional reflexive polytopes</a>, arXiv:1906.01469 [math.CO], 2019. Also Discrete and Computational Geom., 64:2 (2020), 427-452.
%Y A337650 Cf. A037302, A337651, A337652, A337653.
%K A337650 nonn,more
%O A337650 1,2
%A A337650 _N. J. A. Sloane_, Sep 26 2020
%E A337650 a(5) from Heuer and Striker added by _Andrei Zabolotskii_, Jul 23 2025