a(n) is the total number of vertices of degree 2 in Catalan word grid graphs with n parts.
A390115
a(n) is the total number of vertices of degree 2 in Catalan word grid graphs with n parts.
Terms
- a(0) =1a(1) =8a(2) =34a(3) =132a(4) =501a(5) =1892a(6) =7150a(7) =27092a(8) =102986a(9) =392768a(10) =1502596a(11) =5764904a(12) =22175565a(13) =85503420a(14) =330385110a(15) =1279079220a(16) =4960619070a(17) =19269309840a(18) =74959501020a(19) =291986605560
External references
- oeis: A390115