A232978 Number of proper 3-colorings of the bi-iterative graph family G^4_n.

6, 30, 318, 6762, 288354, 24601830, 4198550862, 1433090327658, 978320552816706, 1335732803916035910, 3647440466597769337518, 19919887407714391756372362, 217578288033980580931821414114, 4753070216383849406954016223981350, 207664806338411731603980735696210780942

Offset

0,1

Links

Alois P. Heinz, Table of n, a(n) for n = 0..75

T. Kotek, J. A. Makowsky, Recurrence Relations for Graph Polynomials on Bi-iterative Families of Graphs, arXiv preprint arXiv:1309.4020, 2013

Crossrefs

Cf. A232979.

Sequence in context: A360824 A110374 A360831 * A359882 A332041 A201135

Adjacent sequences: A232975 A232976 A232977 * A232979 A232980 A232981

Keyword

nonn

Author

N. J. A. Sloane, Dec 07 2013

Extensions

a(7)-a(14) from Alois P. Heinz, Dec 21 2013

Status

approved