# Greetings from The On-Line Encyclopedia of Integer Sequences! http://oeis.org/ Search: id:a193665 Showing 1-1 of 1 %I A193665 #10 Feb 19 2015 14:26:10 %S A193665 1,6,33,208,1505,12330,112973,1145568,12742389,154308350,2021296189, %T A193665 28480485024,429565218277,6905903216562,117891260108985, %U A193665 2129869055824000,40600135597843817,814383095809997142,17147155400516728601,378137512431282658800 %N A193665 Q-residue of A075392, where Q=A075392. (See Comments.) %C A193665 The definition of Q-residue is given at A193649. %F A193665 Conjecture: a(n) +(-n-4)*a(n-1) +(n+1)*a(n-2) -a(n-3)=0. - _R. J. Mathar_, Feb 19 2015 %t A193665 q[n_, k_] := (k + 1) (n + 1); (* A075362 *) %t A193665 r[0] = 1; r[k_] := Sum[q[k - 1, i] r[k - 1 - i], {i, 0, k - 1}]; %t A193665 p[n_, k_] := (k + 1) (n + 1); (* A075362 *) %t A193665 v[n_] := Sum[p[n, k] r[n - k], {k, 0, n}] %t A193665 Table[v[n], {n, 0, 20}] (* A193665 *) %t A193665 TableForm[Table[q[i, k], {i, 0, 4}, {k, 0, i}]] %t A193665 Table[r[k], {k, 0, 8}] (* A193665 *) %t A193665 TableForm[Table[p[n, k], {n, 0, 4}, {k, 0, n}]] %Y A193665 Cf. A075362, A193649. %K A193665 nonn %O A193665 0,2 %A A193665 _Clark Kimberling_, Aug 02 2011 # Content is available under The OEIS End-User License Agreement: http://oeis.org/LICENSE