Triangle read by rows: T(n,k) is the number of open meanders with 2n crossings and k exterior top arches, 0 <= k <= n.

A380369

Triangle read by rows: T(n,k) is the number of open meanders with 2n crossings and k exterior top arches, 0 <= k <= n.

Terms

    a(0) =1a(1) =0a(2) =1a(3) =0a(4) =2a(5) =1a(6) =0a(7) =7a(8) =6a(9) =1a(10) =0a(11) =36a(12) =32a(13) =12a(14) =1a(15) =0a(16) =221a(17) =202a(18) =94a(19) =20a(20) =1a(21) =0a(22) =1530a(23) =1417a(24) =728a(25) =220a(26) =30a(27) =1a(28) =0a(29) =11510

External references