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

1,1

Comments

For more information and example see A338401.

Links

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

Crossrefs

Cf. A338401.

Sequence in context: A137299 A329238 A001226 * A093498 A200240 A378021

Adjacent sequences: A338399 A338400 A338401 * A338403 A338404 A338405

Keyword

nonn,frac

Author

Hugo Pfoertner, Oct 24 2020

Status

approved