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A045905 Catafusenes (see reference for precise definition). 2
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 (list; graph; refs; listen; history; text; internal format)
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

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Last modified October 20 19:49 EDT 2021. Contains 348118 sequences. (Running on oeis4.)