Number of 3-noncrossing RNA structures, i.e., the number of 3-noncrossing partial matchings over n vertices and without arcs of length 1.
A133365
Number of 3-noncrossing RNA structures, i.e., the number of 3-noncrossing partial matchings over n vertices and without arcs of length 1.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =5a(4) =13a(5) =36a(6) =105a(7) =321a(8) =1018a(9) =3334a(10) =11216a(11) =38635a(12) =135835a(13) =486337a(14) =1769500a(15) =6531796a(16) =24425758a(17) =92420026a(18) =353444218a(19) =1364933719a(20) =5318450239a(21) =20894505025a(22) =82713826842a(23) =329746065427
External references
- oeis: A133365