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 A137948 #11 Apr 02 2022 14:22:13 %S A137948 1,2,1,3,2,2,4,3,4,6,5,4,6,12,24,6,5,8,18,48,120,7,6,10,24,72,240,720, %T A137948 8,7,12,30,96,360,1440,5040,9,8,14,36,120,480,2160,10080,40320,10,9, %U A137948 16,42,144,600,2880,15120,80640,362880 %N A137948 Triangle read by rows, A000012 * A136579. %C A137948 Row sums = A014144 starting (1, 3, 7, 17, 51, 205, ...). %C A137948 T(n,k) = A245334(n,k) / A007318(n,k), 0 <= k <= n. - _Reinhard Zumkeller_, Aug 31 2014 %H A137948 Reinhard Zumkeller, <a href="/A137948/b137948.txt">Rows n = 0..125 of triangle, flattened</a> %F A137948 As infinite lower triangular matrices, A000012 * A136579, where A000012 = (1; 1,1; 1,1,1; ...) and A136579 = (1; 1,1; 1,1,2; 1,1,2,6; 1,1,2,6,24; ...). %F A137948 T(n,k) = (n+1-k) * k! for 0 <= k <= n. - _Werner Schulte_, Oct 06 2020 %e A137948 First few rows of the triangle: %e A137948 1; %e A137948 2, 1; %e A137948 3, 2, 2; %e A137948 4, 3, 4, 6; %e A137948 5, 4, 6, 12, 24; %e A137948 6, 5, 8, 18, 48, 120; %e A137948 7, 6, 10, 24, 72, 240, 720; %e A137948 ... %o A137948 (Haskell) %o A137948 a137948 n k = a137948_tabl !! n !! k %o A137948 a137948_row n = a137948_tabl !! n %o A137948 a137948_tabl = zipWith (zipWith div) a245334_tabl a007318_tabl %o A137948 -- _Reinhard Zumkeller_, Aug 31 2014 %Y A137948 Cf. A136579, A014144. %Y A137948 Cf. A245334, A007318. %K A137948 nonn,tabl %O A137948 0,2 %A A137948 _Gary W. Adamson_, Feb 28 2008 %E A137948 Offset changed by _Reinhard Zumkeller_, Aug 31 2014