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 A108869 #16 Jun 30 2020 05:35:49
%S A108869 1,7,50,366,2760,21576,176112,1512720,13781376,134110080,1401566976,
%T A108869 15780033792,191537187840,2503044135936,35120982067200,
%U A108869 527284915992576,8439379765788672,143486382677852160,2582856448158007296
%N A108869 E.g.f. : exp(6x)/(1-x).
%C A108869 Binomial transform of A080954.
%C A108869 a(n) is the permanent of the n X n matrix with 7's on the diagonal and 1's elsewhere.
%H A108869 Amiram Eldar, <a href="/A108869/b108869.txt">Table of n, a(n) for n = 0..448</a>
%F A108869 a(n) = n!*Sum_{ k = 0..n } 6^k/k!.
%F A108869 a(n) = Sum_{ k = 0..n } A008290(n, k)*7^k.
%F A108869 a(n) Sum_{ k = 0..n } k!*C(n, k)*6^(n-k).
%p A108869 a:=n->n!*sum(6^k/k!,k=0..n): seq(a(n),n=0..20); # _Emeric Deutsch_, Jul 18 2005
%p A108869 restart:F(x):=exp(6*x)/(1-x): f[0]:=F(x): for n from 1 to 20 do f[n]:=diff(f[n-1],x) od: x:=0: seq(f[n],n=0..18); # _Zerinvary Lajos_, Apr 03 2009
%t A108869 a[n_] := n! * Sum[6^k/k!, {k, 0, n}]; Array[a, 19, 0] (* _Amiram Eldar_, Jun 30 2020 *)
%Y A108869 Cf. A000142, A000522, A008290, A010842, A053486, A053487, A080954.
%K A108869 easy,nonn
%O A108869 0,2
%A A108869 _Philippe Deléham_, Jul 13 2005
%E A108869 More terms from _Emeric Deutsch_, Jul 18 2005