Triangle read by rows: T(n,k) is the number of k-element equivalence classes of closed meanders with 2n points.

A339460

Triangle read by rows: T(n,k) is the number of k-element equivalence classes of closed meanders with 2n points.

Terms

    a(0) =1a(1) =2a(2) =8a(3) =42a(4) =262a(5) =1820a(6) =4a(7) =13756a(8) =32a(9) =110394a(10) =280a(11) =928790a(12) =2328a(13) =4a(14) =8110104a(15) =21294a(16) =56a(17) =73040142a(18) =191396a(19) =540a(20) =24a(21) =674775338a(22) =1798624a(23) =5214a(24) =472a(25) =6370633938a(26) =17113152a(27) =48240a(28) =6482a(29) =32

External references