Expansion of 1/((1-x)(1-3x)(1-4x)(1-6x)).

Terms

a(0) =1a(1) =14a(2) =129a(3) =994a(4) =6965a(5) =46158a(6) =295513a(7) =1850618a(8) =11423709a(9) =69851782a(10) =424437377a(11) =2568196722a(12) =15496267333a(13) =93328343486a(14) =561380193321