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A370964
a(n) = number of "weakly lonesum" 2 X 2 X n tensors.
3
1, 16, 254, 4006, 62834, 980926, 15251714, 236305246, 3649992194, 56225671966, 864046126274, 13249946549086, 202798763405954, 3098675363464606, 47273845225223234, 720219685203906526, 10958863373616410114, 166560903942055522846, 2528904905860164038594
OFFSET
0,2
FORMULA
From Filip Stappers, Aug 25 2024: (Start)
a(n) = 2*15^n - 14^n.
G.f.: (1-13*z) / ((1-15*z)*(1-14*z)). (End)
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
N. J. A. Sloane, Apr 04 2024
EXTENSIONS
a(7) from Michael S. Branicky, Apr 07 2024
a(0) and more terms from Filip Stappers, Aug 25 2024
STATUS
approved