%I A161711
%S A161711 1,2,13,26,33,26,3,62,159,302,499,758,1087,1494,1987,2574,
%T A161711 3263,4062,4979,6022,7199,8518,9987,11614,13407,15374,17523,
%U A161711 19862,22399,25142,28099,31278,34687,38334,42227,46374,50783
%V A161711 1,2,13,26,33,26,-3,-62,-159,-302,-499,-758,-1087,-1494,-1987,-2574,
%W A161711 -3263,-4062,-4979,-6022,-7199,-8518,-9987,-11614,-13407,-15374,-17523,
%X A161711 -19862,-22399,-25142,-28099,-31278,-34687,-38334,-42227,-46374,-50783
%N A161711 (-4*n^3 + 27*n^2 - 20*n + 3)/3.
%C A161711 {a(k): 0 <= k < 4} = divisors of 26:
%C A161711 a(n) = A027750(A006218(25) + k + 1), 0 <= k < A000005(26).
%H A161711 R. Zumkeller, <a href="a161700.txt">Enumerations of Divisors</a>
%F A161711 a(n) = C(n,0) + C(n,1) + 10*C(n,2) - 8*C(n,3).
%e A161711 Differences of divisors of 26 to compute the coefficients of their interpolating 
               polynomial, see formula:
%e A161711 1 ... 2 .. 13 ... 26
%e A161711 .. 1 .. 11 .. 13
%e A161711 .... 10 ... 2
%e A161711 ....... -8.
%Y A161711 A005408, A000124, A016813, A086514, A000125, A058331, A002522, A161701, 
               A161702, A161703, A000127, A161704, A161706, A161707, A161708, A161710, 
               A080856, A161712, A161713, A161715, A006261.
%Y A161711 Sequence in context: A101863 A018628 A018657 this_sequence A018745 A117983 
               A018400
%Y A161711 Adjacent sequences: A161708 A161709 A161710 this_sequence A161712 A161713 
               A161714
%K A161711 sign
%O A161711 0,2
%A A161711 Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Jun 17 2009