Expansion of 1/((1-x)(1-3x)(1-5x)(1-7x)).

Terms

a(0) =1a(1) =16a(2) =170a(3) =1520a(4) =12411a(5) =96096a(6) =719860a(7) =5278240a(8) =38153621a(9) =273134576a(10) =1942326750a(11) =13748476560a(12) =97001079631a(13) =682818667456