A011949 Number of Barlow packings with group P6(bar)m2 that repeat after 2n layers.
0, 0, 1, 2, 6, 12, 28, 56, 119, 240, 496, 990, 2016, 4032, 8121, 16256, 32640, 65268, 130816, 261630, 523747, 1047552, 2096128, 4192200, 8386554, 16773120, 33550216, 67100670, 134209536, 268418820, 536854528, 1073709056, 2147450383, 4294901760, 8589869022, 17179737120, 34359607296
Offset: 1
Links
- J. E. Iglesias, Enumeration of closest-packings by the space group: a simple approach, Z. Krist. 221 (2006) 237-245, Table 3.
- T. J. McLarnan, The numbers of polytypes in close packings and related structures, Zeitschr. Krist. 155, 269-291 (1981).
Extensions
More terms from M. F. Hasler, May 28 2025