G.f. satisfies: A(x) = 1 + x*A(x)^4/A(-x)^4.

Terms

a(0) =1a(1) =1a(2) =8a(3) =32a(4) =280a(5) =1728a(6) =16744a(7) =117856a(8) =1202552a(9) =9044352a(10) =95203784a(11) =745451168a(12) =8011827928a(13) =64459117632a(14) =703166465320