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 A008418 #28 Nov 11 2024 00:20:28
%S A008418 1,18,162,978,4482,16722,53154,148626,374274,864146,1854882,3742290,
%T A008418 7159170,13079250,22952610,38878482,63821826,101880594,158611106,
%U A008418 241419474,360027522,527022162,758497698,1074801042,1501390338
%N A008418 Coordination sequence for 9-dimensional cubic lattice.
%H A008418 Seiichi Manyama, <a href="/A008418/b008418.txt">Table of n, a(n) for n = 0..10000</a> (terms 0..1000 from T. D. Noe)
%H A008418 J. H. Conway and N. J. A. Sloane, Low-Dimensional Lattices VII: Coordination Sequences, Proc. Royal Soc. London, A453 (1997), 2369-2389 (<a href="http://neilsloane.com/doc/Me220.pdf">pdf</a>).
%H A008418 <a href="/index/Rec#order_09">Index entries for linear recurrences with constant coefficients</a>, signature (9, -36, 84, -126, 126, -84, 36, -9, 1).
%F A008418 G.f.: ((1+x)/(1-x))^9.
%F A008418 n*a(n) = 18*a(n-1) + (n-2)*a(n-2) for n > 1. - _Seiichi Manyama_, Jun 06 2018
%t A008418 CoefficientList[Series[((1 + x)/(1 - x))^9, {x, 0, 30}], x] (* _Wesley Ivan Hurt_, Feb 04 2017 *)
%t A008418 LinearRecurrence[{9,-36,84,-126,126,-84,36,-9,1},{1,18,162,978,4482,16722,53154,148626,374274,864146},30] (* _Harvey P. Dale_, Aug 01 2024 *)
%K A008418 nonn,easy
%O A008418 0,2
%A A008418 _N. J. A. Sloane_