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Table 2 The Laplacian spectral radii of some Halin graphs with two interior vertices

From: On the Laplacian spectral radii of Halin graphs

  G μ ( G )
n = 6 H(2,2) 5.0000
n = 7 H(3,2) 5.6180
n = 8 H(3,3) 6.0000
H(4,2) 6.3234
n = 9 H(4,3) 6.5315
n = 10 H(4,4) 6.8820
H(5,3) 7.3058
n = 11 H(5,4) 7.4911
H(6,3) 8.1938
n = 12 H(5,5) 7.8605
H(6,4) 8.2932
H(7,3) 9.1335
n = 13 H(6,5) 8.4827
H(7,4) 9.1923
H(8,3) 10.0976
n = 14 H(6,6) 8.8562
H(7,5) 9.2930
H(8,4) 10.1358
n = 15 H(7,6) 9.4835
H(8,5) 10.1954
H(9,4) 11.1012
n = 16 H(9,5) 11.1399
H(10,4) 12.0785
n = 17 H(10,5) 12.1055
H(11,4) 13.0627
n = 18 H(12,4) 14.0513