A011964 Number of ferrites M_{10}Y_n that repeat after 6n+50 layers.

0, 3, 5, 18, 38, 100, 198, 445, 829, 1605, 2851, 5014, 8361, 13843, 21907, 34362, 52327, 78571, 115434, 167695, 238899, 337005, 468306, 644123, 875190, 1178882, 1570349, 2075958, 2719013, 3535145, 4559850, 5843801, 7434644, 9404325, 11820308, 14776196, 18367470, 22720370, 27958348, 34251990, 41766802, 50718234, 61328772, 73877844, 88644852, 105993414

Offset

1,2

Links

Table of n, a(n) for n=1..46.

T. J. McLarnan, The numbers of polytypes in close-packings and related structures, Zeits. Krist. 155, 269-291 (1981).

Maple

A011964 := proc(n)
    F(10, n) ; # F implemented in A011961
end proc:
seq( A011964(n), n=1..80); # R. J. Mathar, Jul 19 2026

Crossrefs

Sequence in context: A136131 A143546 A069066 * A123793 A196420 A199676

Adjacent sequences: A011961 A011962 A011963 * A011965 A011966 A011967

Keyword

nonn,easy,changed

Author

N. J. A. Sloane

Status

approved