The partition function G(n,4).

Terms

a(0) =1a(1) =1a(2) =2a(3) =5a(4) =15a(5) =51a(6) =196a(7) =827a(8) =3795a(9) =18755a(10) =99146a(11) =556711a(12) =3305017a(13) =20655285a(14) =135399720a(15) =927973061a(16) =6631556521a(17) =49294051497a(18) =380306658250