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A sequence B(3,n) arising from the enumeration of braids.
1

%I #5 Oct 27 2015 13:19:14

%S 15,90,602,4060,28356,200088

%N A sequence B(3,n) arising from the enumeration of braids.

%C It would be nice to have a recurrence.

%D Iris Anshel, Personal communication, Oct 23 2015.

%Y Cf. A263628.

%K nonn,more

%O 2,1

%A _N. J. A. Sloane_, Oct 27 2015