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 A011855 #19 Jun 13 2023 11:10:34 %S A011855 0,0,0,0,0,0,0,0,0,0,1,6,24,79,222,556,1271,2701,5402,10264,18662, %T A011855 32658,55268,90798,145278,226997,347172,520758,767433,1112778,1589683, %U A011855 2240008,3116533,4285233,5827917,7845273 %N A011855 a(n) = floor(binomial(n,9)/9). %H A011855 <a href="/index/Rec#order_82">Index entries for linear recurrences with constant coefficients</a>, signature (10, -45, 120, -210, 252, -210, 120, -45, 9, 9, -45, 120, -210, 252, -210, 120, -45, 9, 9, -45, 120, -210, 252, -210, 120, -45, 9, 9, -45, 120, -210, 252, -210, 120, -45, 9, 9, -45, 120, -210, 252, -210, 120, -45, 9, 9, -45, 120, -210, 252, -210, 120, -45, 9, 9, -45, 120, -210, 252, -210, 120, -45, 9, 9, -45, 120, -210, 252, -210, 120, -45, 9, 9, -45, 120, -210, 252, -210, 120, -45, 10, -1). %t A011855 Floor[Binomial[Range[0,80],9]/9] (* _Harvey P. Dale_, Aug 30 2016 *) %o A011855 (Sage) [floor(binomial(n,9)/9) for n in range(0,36)] # _Zerinvary Lajos_, Dec 01 2009 %o A011855 (PARI) a(n) = binomial(n,9)\9; \\ _Michel Marcus_, Jan 29 2018 %Y A011855 A column of triangle A011857. %K A011855 nonn %O A011855 0,12 %A A011855 _N. J. A. Sloane_