Number of 3-element ordered antichain covers of an unlabeled n-element set.

Terms

a(0) =2a(1) =17a(2) =71a(3) =212a(4) =518a(5) =1106a(6) =2142a(7) =3852a(8) =6534a(9) =10571a(10) =16445a(11) =24752a(12) =36218a(13) =51716a(14) =72284a(15) =99144a(16) =133722a(17) =177669a(18) =232883a(19) =301532a(20) =386078a(21) =489302a(22) =614330a(23) =764660a(24) =944190a(25) =1157247a(26) =1408617a(27) =1703576a(28) =2047922a(29) =2448008