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 A215646 #6 Nov 12 2012 17:18:36 %S A215646 0,3,19,59,134,255,433,679,1004,1419,1935,2563,3314,4199,5229,6415, %T A215646 7768,9299,11019,12939,15070,17423,20009,22839,25924,29275,32903, %U A215646 36819,41034,45559,50405,55583,61104,66979,73219,79835,86838,94239,102049,110279,118940 %N A215646 n * (11*n^2 + 6*n + 1) / 6. %C A215646 For n > 0: sums of rows of triangle in A215631. %o A215646 (Haskell) %o A215646 a215646 n = n * (n * (11*n + 6) + 1) `div` 6 %o A215646 (Maxima) A215646(n):=n*(11*n^2+6*n+1)/6$ %o A215646 makelist(A215646(n),n,0,20); /* _Martin Ettl_, Nov 12 2012 */ %K A215646 nonn %O A215646 0,2 %A A215646 _Reinhard Zumkeller_, Nov 11 2012