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 A143614 #6 May 29 2023 13:01:33 %S A143614 1,1,0,2,1,0,2,0,1,0,4,2,1,1,0,2,0,0,0,1,0,6,3,2,1,1,1,0,4,0,1,0,1,0, %T A143614 1,0,6,3,0,2,1,0,1,1,0,4,0,2,0,0,0,1,0,1,0,10,5,3,2,2,1,1,1,1,1,0,4,0, %U A143614 0,0,1,0,1,0,0,0,1,0,12,6,4,3,2,2,1,1,1,1,1,1,0,6,0,2,0,1,0,0,0,1,0,1,0,1,0 %N A143614 Triangle read by rows: A054521 * A051731 as infinite lower triangular matrices. %C A143614 Left border = phi(n), A000010: (1, 1, 2, 2, 4, 2, 6,...). %C A143614 Row sums = A143615: (1, 1, 3, 3, 8, 3, 14, 7,...). %F A143614 A054521 records the relative primes of n, indicated by a 1's in row n, 0 otherwise. A051731 = the inverse Moebius transform, in which 1's by rows indicate the divisors of n, 0 otherwise. %e A143614 First few rows of the triangle = %e A143614 1; %e A143614 1, 0; %e A143614 2, 1, 0; %e A143614 2, 0, 1, 0; %e A143614 4, 2, 1, 1, 0; %e A143614 2, 0, 0, 0, 1, 0; %e A143614 6, 3, 2, 1, 1, 1, 0; %e A143614 4, 0, 1, 0, 1, 0, 1, 0; %e A143614 6, 3, 0, 2, 1, 0, 1, 1, 0; %e A143614 ... %Y A143614 Cf. A000010, A051731, A054521, A143615. %K A143614 nonn,tabl %O A143614 1,4 %A A143614 _Gary W. Adamson_, Aug 27 2008 %E A143614 a(96) and a(101) split by _Georg Fischer_, May 29 2023