Expansion of e.g.f. exp( Sum_{k>=0} x^(3*k+2) / (3*k+2)! ).

Terms

a(0) =1a(1) =0a(2) =1a(3) =0a(4) =3a(5) =1a(6) =15a(7) =21a(8) =106a(9) =378a(10) =1116a(11) =6931a(12) =20196a(13) =136500a(14) =558559a(15) =3103191a(16) =18524418a(17) =90852217a(18) =661904622a(19) =3569749659a(20) =25657118047a(21) =171935108541