

A112619


Number of connected simple graphs with n vertices, n+2 edges, and vertex degrees no more than 4.


7



0, 0, 0, 1, 4, 18, 79, 326, 1278, 4875, 17978, 64720, 227842, 787546, 2678207, 8982754, 29761361, 97558039, 316778169, 1019996738, 3259673935, 10347077497, 32644696187, 102425388286, 319754805262
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OFFSET

1,5


LINKS



PROG

(nauty/bash)
for n in {4..15}; do geng c D4 ${n} $((n+2)):$((n+2)) u; done # Andrey Zabolotskiy, Nov 24 2017


CROSSREFS

The analogs for n+k edges with k = 1, 0, ..., 7 are: A000602, A036671, A112410, this sequence, A112408, A112424, A112425, A112426, A112442. Cf. A121941.


KEYWORD

nonn


AUTHOR



EXTENSIONS



STATUS

approved



