Expansion of 1/((1-x)(1-2x)(1-4x)(1-7x)).

Terms

a(0) =1a(1) =14a(2) =133a(3) =1086a(4) =8253a(5) =60438a(6) =433861a(7) =3080462a(8) =21737485a(9) =152860422a(10) =1072817109a(11) =7520900478a(12) =52691034397a(13) =369016181366