Number of convex functions from {1,...,n} to itself.

Terms

a(0) =1a(1) =1a(2) =4a(3) =16a(4) =54a(5) =168a(6) =462a(7) =1212a(8) =2937a(9) =6832a(10) =15135a(11) =32430a(12) =66898a(13) =134710a(14) =263466a(15) =504308a(16) =944208a(17) =1736575a(18) =3134832a(19) =5574947a(20) =9760954a(21) =16868418a(22) =28771587a(23) =48513127a(24) =80867486a(25) =133455462a(26) =218041708a(27) =353039664a(28) =566580113a(29) =901958971