A335676 Number of arithmetical structures on D_n.

14, 46, 176, 620, 2218, 7938, 28572, 103384, 376056, 1374680, 5048348, 18618290, 68932582, 256133188, 954856744, 3570492960, 13388550056, 50334109160, 189684561610, 716420218810, 2711456910222, 10281958081812, 39059990775594, 148635185291644, 566498545019834, 2162330791492290, 8265205867169156

Offset

4,1

Comments

Archer et al. give terms 4 through 43.

Links

Table of n, a(n) for n=4..30.

Archer, Kassie, Abigail C. Bishop, Alexander Diaz-Lopez, Luis D. García Puente, Darren Glass, and Joel Louwsma. "Arithmetical structures on bidents." Discrete Mathematics 343, no. 7 (2020): #111850. Also arXiv:1903.01393, 2019-2020. See Table 1.

Crossrefs

Cf. A335676.

Sequence in context: A242581 A242582 A242583 * A334830 A159450 A243040

Adjacent sequences: A335673 A335674 A335675 * A335677 A335678 A335679

Keyword

nonn

Author

N. J. A. Sloane, Jun 17 2020

Status

approved