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%I #7 Apr 15 2024 08:28:57
%S 3,2,10,15,42,68,162,280,600,1088,2214,4112,8154,15366,30052,57208,
%T 111166,212982,412890,794688,1540002,2974150,5767344,11167872,
%U 21680832,42073640,81787057,159005154,309503502,602667098
%N Number of Barlow packings with group P3m1 that repeat after n layers.
%H T. J. McLarnan, <a href="http://dx.doi.org/10.1524/zkri.1981.155.3-4.269">The numbers of polytypes in close packings and related structures</a>, Zeits. Krist. 155, 269-291 (1981).
%K nonn,easy
%O 9,1
%A _N. J. A. Sloane_.
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