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 A077820 #8 Dec 15 2024 12:11:20 %S A077820 0,0,1,2,8,11,14,15,20 %N A077820 a(n) is the exponent of 2 in the denominator of the probability P(n) of the occurrence of a 3-dimensional self-trapping walk of length n. %D A077820 See under A077818. %F A077820 P(n) = A077818(n) / ( 5^(n-1) * 3^A077819(n) * 2^a(n) ). %e A077820 See under A077818. %Y A077820 Cf. A077818, A077819, A377161, A377162, A378903. %K A077820 nonn,frac,more %O A077820 11,4 %A A077820 _Hugo Pfoertner_, Nov 17 2002