a(n) is the number of arch configuration solutions with n arches derived from 2 concentric arches using the exterior arch splitting algorithm.
A354387
a(n) is the number of arch configuration solutions with n arches derived from 2 concentric arches using the exterior arch splitting algorithm.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =6a(4) =18a(5) =42a(6) =130a(7) =332a(8) =1048a(9) =2836a(10) =9078a(11) =25578a(12) =82730a(13) =240124a(14) =782956a(15) =2324800
External references
- oeis: A354387