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 A110749 #10 Jul 14 2024 16:35:24
%S A110749 1,2,4,3,6,9,4,8,21,61,5,1,51,2,52,6,21,81,42,3,63,7,41,12,82,53,24,
%T A110749 94,8,61,42,23,4,84,65,46,9,81,72,63,54,45,36,27,18,1,2,3,4,5,6,7,8,9,
%U A110749 1,11,22,33,44,55,66,77,88,99,11,121,21,42,63,84,6,27,48,69,801,21,231,441
%N A110749 Triangle read by rows with the n-th row containing the first n multiples of n with digits reversed.
%H A110749 Harvey P. Dale, <a href="/A110749/b110749.txt">Table of n, a(n) for n = 1..1000</a>
%e A110749 The triangle is:
%e A110749 1
%e A110749 2 4
%e A110749 3 6 9
%e A110749 4 8 21 61
%e A110749 5 1 15 2 52
%e A110749 etc
%t A110749 Table[IntegerReverse[n*Range[n]],{n,20}]//Flatten (* _Harvey P. Dale_, Jul 14 2024 *)
%o A110749 (PARI) T(n, k) = subst(Polrev(digits(k*n)), x, 10); \\ _Michel Marcus_, Sep 16 2013
%Y A110749 The non-reversed digit triangle is A075362.
%K A110749 base,easy,nonn,tabl
%O A110749 1,2
%A A110749 _Amarnath Murthy_, Aug 10 2005
%E A110749 More terms from Bruce Corrigan (scentman(AT)myfamily.com), Aug 10 2005