A045905 Catafusenes (see reference for precise definition).

0, 0, 0, 0, 1, 2, 16, 80, 473, 2517, 13431, 69357, 353943, 1780894, 8886254, 44024308, 217021967, 1065653519, 5217704239, 25491204743, 124335254416, 605720277647, 2948274685881, 14341442951945, 69732440151924

Offset

0,6

References

S. J. Cyvin et al., Enumeration and classification of certain polygonal systems... : annelated catafusenes, J. Chem. Inform. Comput. Sci., 34 (1994), 1174-1180, ^4O = ^4F_7 page 1178.

Links

Table of n, a(n) for n=0..24.

Formula

8*a(n) = A045829(n) + 3*A045445(n/2) + 2*A002212(n/4) + 2*A039660(n) for n > 0, where sequence values with non-integer index are implicitly defined as 0. - R. J. Mathar, Jul 30 2019

Crossrefs

Last column of A121178.

Sequence in context: A264573 A225959 A336174 * A012680 A012684 A234004

Adjacent sequences: A045902 A045903 A045904 * A045906 A045907 A045908

Keyword

nonn

Author

N. J. A. Sloane

Status

approved