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A243315
Number of ways to reciprocally link elements of an n X 9 array either to themselves or to exactly one king-move neighbor.
2
1, 55, 237472, 371654153, 757341382671, 1450226501771584, 2820152941289640505, 5463664833842177843423, 10594819370472223969569120, 20540255065209806005525289313, 39823725482559144291828665014967, 77209746313875957204633819730760448
OFFSET
0,2
LINKS
CROSSREFS
Column k=9 of A220644.
Sequence in context: A287053 A046194 A172808 * A172856 A093255 A172896
KEYWORD
nonn
AUTHOR
Alois P. Heinz, Jun 03 2014
STATUS
approved