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 A334703 #18 Jul 09 2025 04:52:24 %S A334703 0,0,0,0,0,4,0,1,20,84,0,4,56,220,560,0,10,120,455,1140,2300,0,20,220, %T A334703 816,2024,4060,7140,0,35,364,1330,3276,6545,11480,18424,0,56,560,2024, %U A334703 4960,9880,17296,27720,41664,0,84,816,2925,7140,14190,24804,39711,59640,85320 %N A334703 Triangle read by rows: T(n,k) = binomial(n*k,3) (0 <= k <= n). %e A334703 Triangle begins: %e A334703 [0] %e A334703 [0, 0] %e A334703 [0, 0, 4] %e A334703 [0, 1, 20, 84] %e A334703 [0, 4, 56, 220, 560] %e A334703 [0, 10, 120, 455, 1140, 2300] %e A334703 [0, 20, 220, 816, 2024, 4060, 7140] %e A334703 [0, 35, 364, 1330, 3276, 6545, 11480, 18424] %e A334703 [0, 56, 560, 2024, 4960, 9880, 17296, 27720, 41664] %e A334703 [0, 84, 816, 2925, 7140, 14190, 24804, 39711, 59640, 85320] %e A334703 ... %Y A334703 See A334702 for another version. %Y A334703 This is a companion to the triangles A334704 and A334705. %Y A334703 Cf. A007318. %K A334703 nonn,tabl %O A334703 0,6 %A A334703 _N. J. A. Sloane_, Jun 13 2020