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 A326120 #31 Jan 24 2021 09:50:56
%S A326120 1,24,3927,41664256,5251256253125,6362161296777646656,
%T A326120 749343240116807117649823543,864512409632768262144209715216777216,
%U A326120 981729656159049531441478296943046721387420489,10100100010000100000100000010000000100000000100000000010000000000
%N A326120 a(n) is the concatenation of n^1, n^2, ..., n^n.
%C A326120 a(100) has 10200 digits.
%C A326120 a(n) is the concatenation of the n terms of the n-th row of A075363 triangle. - _Michel Marcus_, Sep 15 2019
%p A326120 a:= n-> parse(cat(n^j$j=1..n)):
%p A326120 seq(a(n), n=1..14); # _Alois P. Heinz_, Jan 24 2021
%t A326120 a[n_] := FromDigits@ Flatten@ IntegerDigits[n^Range[n]]; Array[a, 10] (* _Giovanni Resta_, Sep 12 2019 *)
%o A326120 (Python)
%o A326120 def a(n): return int("".join(str(n**i) for i in range(1, n+1)))
%o A326120 print([a(n) for n in range(1, 11)]) # _Michael S. Branicky_, Jan 24 2021
%Y A326120 Cf. A007908, A019521, A019522, A053062, A075363.
%K A326120 nonn,base,easy,less
%O A326120 1,2
%A A326120 _Trevor Mulindi_, Sep 10 2019
%E A326120 More terms from _Giovanni Resta_, Sep 12 2019