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 A100790 #11 Oct 21 2022 21:40:54
%S A100790 1,9,47,183,560,1426,3164,6322,11643,20095,32901,51569,77922,114128,
%T A100790 162730,226676,309349,414597,546763,710715,911876,1156254,1450472,
%U A100790 1801798,2218175,2708251,3281409,3947797,4718358,5604860
%N A100790 First differences of A047780.
%H A100790 <a href="/index/Rec#order_06">Index entries for linear recurrences with constant coefficients</a>, signature (6, -15, 20, -15, 6, -1).
%F A100790 (1/24)(n+1)(6n^4+9n^3+23n^2+46n+24). - _Ralf Stephan_, May 16 2007
%F A100790 a(0)=1, a(1)=9, a(2)=47, a(3)=183, a(4)=560, a(5)=1426, a(n)= 6*a(n-1)- 15*a(n-2)+ 20*a(n-3)-15*a(n-4)+6*a(n-5)-a(n-6). - _Harvey P. Dale_, Dec 18 2013
%t A100790 Differences[CoefficientList[Series[x (1+3x+8x^2+16x^3+2x^4)/(1-x)^7,{x,0,50}],x]] (* or *) LinearRecurrence[{6,-15,20,-15,6,-1},{1,9,47,183,560,1426},50] (* _Harvey P. Dale_, Dec 18 2013 *)
%o A100790 (PARI) a(n)=(n+1)(6*n^4+9*n^3+23*n^2+46*n+24)/24 \\ _Charles R Greathouse IV_, Oct 21 2022
%K A100790 nonn,easy
%O A100790 0,2
%A A100790 _N. J. A. Sloane_, Jan 04 2005