Recip transform of 2*(1 + x^2 + x^4 + x^6)-1/(1-x).

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =1a(8) =3a(9) =23a(10) =135a(11) =599a(12) =2187a(13) =6947a(14) =19899a(15) =52667a(16) =131109a(17) =311525a(18) =717525a(19) =1635781a(20) =3802461a(21) =9332573a(22) =24773869a(23) =70874381a(24) =212534247a(25) =646664443a(26) =1949536667a(27) =5749101579a(28) =16503012263a(29) =46118290863