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 A281580 #10 Sep 08 2022 08:46:18
%S A281580 1,90,4851,204156,7413705,244222650,7511839335,219683466288,
%T A281580 6183023199255,168899639028120,4505395859893071,117891537949758600,
%U A281580 3036500678480436531,77190387796530738576,1940723247304668029175,48339506285032758609456,1194448077521704400002650
%N A281580 a(n) = binomial(9*n, n-9).
%C A281580 Row 9*n, column n-9 of A007318. - _Felix Fröhlich_, Feb 05 2017
%t A281580 Table[Binomial[9 n, n - 9], {n, 9, 25}]
%o A281580 (Magma) [Binomial(9*n, n-9): n in [9..30]];
%o A281580 (PARI) a(n) = binomial(9*n, n-9) \\ _Felix Fröhlich_, Feb 05 2017
%Y A281580 Cf. sequences with formula binomial(k*n, n-k): A002694 (k=2), A004321 (k=3), A004334 (k=4), A004347 (k=5), A004361 (k=6), A004375 (k=7), A004389 (k=8), this sequence (k=9).
%K A281580 nonn,easy
%O A281580 9,2
%A A281580 _Vincenzo Librandi_, Feb 02 2017