E.g.f.: exp(4*x + x^2/2).

Terms

a(0) =1a(1) =4a(2) =17a(3) =76a(4) =355a(5) =1724a(6) =8671a(7) =45028a(8) =240809a(9) =1323460a(10) =7461121a(11) =43079084a(12) =254388667a(13) =1534503676a(14) =9445067375a(15) =59263320964a(16) =378729294481