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 A038260 #8 Jul 08 2025 22:14:04 %S A038260 1,6,6,36,72,36,216,648,648,216,1296,5184,7776,5184,1296,7776,38880, %T A038260 77760,77760,38880,7776,46656,279936,699840,933120,699840,279936, %U A038260 46656,279936,1959552,5878656,9797760,9797760,5878656,1959552,279936,1679616 %N A038260 Triangle read by rows: T(n,k) = binomial(n,k)*6^(n-k)*6^k, 0<=k<=n. %D A038260 B. N. Cyvin et al., Isomer enumeration of unbranched catacondensed polygonal systems with pentagons and heptagons, Match, No. 34 (Oct 1996), pp. 109-121. %p A038260 seq(seq(binomial(n,k)*6^(n-k)*6^k,k=0..n),n=0..8); (C. Ronaldo) %K A038260 nonn,tabl,easy %O A038260 0,2 %A A038260 _N. J. A. Sloane_