# Greetings from The On-Line Encyclopedia of Integer Sequences! http://oeis.org/ Search: id:a025788 Showing 1-1 of 1 %I A025788 #9 Jul 30 2015 22:15:06 %S A025788 1,1,1,1,1,1,1,2,2,2,2,2,3,3,4,4,4,4,4,5,5,6,6,6,7,7,8,8,9,9,9,10,10, %T A025788 11,11,12,13,13,14,14,15,15,16,17,17,18,18,19,20,21,22,22,23,23,24,25, %U A025788 26,27,27,28,29,30,31,32,33 %N A025788 Expansion of 1/((1-x)(1-x^7)(1-x^12)). %H A025788 Index entries for linear recurrences with constant coefficients, signature (1, 0, 0, 0, 0, 0, 1, -1, 0, 0, 0, 1, -1, 0, 0, 0, 0, 0, -1, 1). %F A025788 a(0)=1, a(1)=1, a(2)=1, a(3)=1, a(4)=1, a(5)=1, a(6)=1, a(7)=2, a(8)=2, a(9)=2, a(10)=2, a(11)=2, a(12)=3, a(13)=3, a(14)=4, a(15)=4, a(16)=4, a(17)=4, a(18)=4, a(19)=5, a(n)=a(n-1)+a(n-7)-a(n-8)+a(n-12)-a(n-13)- a(n-19)+ a(n-20). - _Harvey P. Dale_, Jul 29 2013 %t A025788 CoefficientList[Series[1/((1-x)(1-x^7)(1-x^12)),{x,0,80}],x] (* or *) LinearRecurrence[{1,0,0,0,0,0,1,-1,0,0,0,1,-1,0,0,0,0,0,-1,1},{1,1,1,1,1,1,1,2,2,2,2,2,3,3,4,4,4,4,4,5},80] (* _Harvey P. Dale_, Jul 29 2013 *) %K A025788 nonn %O A025788 0,8 %A A025788 _N. J. A. Sloane_. # Content is available under The OEIS End-User License Agreement: http://oeis.org/LICENSE