Expansion of e.g.f.: cosh(sqrt(2)*x)/(1-x).

Terms

a(0) =1a(1) =1a(2) =4a(3) =12a(4) =52a(5) =260a(6) =1568a(7) =10976a(8) =87824a(9) =790416a(10) =7904192a(11) =86946112a(12) =1043353408a(13) =13563594304a(14) =189890320384