A355952 Column 0 of the irregular triangle A355588.

1, 1, 1, 1, 1, 1, 5, 5, 35, 35, 35, 7, 55, 11, 5005, 5005, 5005, 5005, 85085, 85085, 323323, 323323, 46189, 46189, 437437, 572033, 185910725, 185910725, 26558675, 185910725, 5391411025, 5391411025, 1453336885, 43332575, 4775249765, 15193976525, 6685349671, 283758475

Offset: 0

Author

Hugo Pfoertner, Jul 21 2022

Keywords

• nonn
• frac

Comments

a(n) are the denominators v in the representation R = s/t - (2*sqrt(3)/Pi)*u/v of the resistance between two nodes with distance n on the same grid line in an infinite triangular lattice of one-ohm resistors. The corresponding denominators are A355951. See there for more information, e.g., how to determine s/t.

Crossrefs

Cf. A355585, A355588, A355951 (numerators).

Programs

PARI

See A355951.