A338402 a(n) is the denominator of the resistance R(n) = A338401(n)/a(n) of a triangular network of 3*n*(n+1)/2 one Ohm resistors in a hexagonal lattice arrangement.

3, 9, 7, 123, 1773, 21075, 68761, 4989753, 178945525, 396450465051, 144693391952079, 4833128874789907, 751463705427149325, 59315127102256318272081, 30288529373611329886681, 335082000330404529286853990499, 6485606445639875637410148108213, 7842015457241561891262053489240216057

Offset: 1

Author

Hugo Pfoertner, Oct 24 2020

Keywords

• nonn
• frac

Comments

For more information and example see A338401.

Links

• Hugo Pfoertner, Table of n, a(n) for n = 1..50

Crossrefs

Cf. A338401.