Expansion of e.g.f. exp(x^4/24 * (1+x)^4).

Terms

a(0) =1a(1) =0a(2) =0a(3) =0a(4) =1a(5) =20a(6) =180a(7) =840a(8) =1715a(9) =2520a(10) =88200a(11) =1940400a(12) =29111775a(13) =303603300a(14) =2188286100a(15) =12549537000a(16) =143029511625