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 A220416 #38 Feb 16 2022 18:24:51 %S A220416 1,2,9,4,25,216,7,64,729,10000,11,144,2197,38416,759375,16,289,5832, %T A220416 130321,3200000,85766121,22,529,13824,390625,11881376,387420489, %U A220416 13492928512,29,900,29791,1048576,39135393,1544804416,64339296875,2821109907456 %N A220416 Table T(n,k) = ((n+k-1)*(n+k-2)/2+n)^n, n,k >0 read by antidiagonals. %C A220416 The first column is A000124. %H A220416 Boris Putievskiy, <a href="/A220416/b220416.txt">Rows n = 1..30 of triangle, flattened</a> %H A220416 Boris Putievskiy, <a href="http://arxiv.org/abs/1212.2732">Transformations Integer Sequences And Pairing Functions</a>, arXiv:1212.2732 [math.CO], 2012. %F A220416 As a linear array, the sequence is a(n) = n^A002260(n) or %F A220416 a(n) = n^(n-t(t+1)/2), where t=floor[(-1+sqrt(8*n-7))/2]. %e A220416 The start of the sequence as triangle array is: %e A220416 1; %e A220416 2,9; %e A220416 4,25,216; %e A220416 7,64,729,10000; %e A220416 11, 144, 2197, 38416, 759375; %e A220416 ... %o A220416 (Python) %o A220416 t=int((math.sqrt(8*n-7) - 1)/ 2) %o A220416 m=n**(n-t*(t+1)/2) %Y A220416 Cf. A002260, A000124. %K A220416 nonn,tabl %O A220416 1,2 %A A220416 _Boris Putievskiy_, Dec 14 2012