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A236554 Number of involutions in the quaternion ring over Z/(2^n)Z with i^2=j^2=1. 1
8, 64, 288, 1056, 4128, 16416, 65568, 262176 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
FORMULA
a(n) = A236553(2^n).
MATHEMATICA
invo11[n_] := Length@Reduce[a^2 - b^2 + c^2 + d^2 ==1 && 2 a b== 0 && 2 a c == 0 && 2 a d == 0, Modulus -> n]; Table[invo11[2^n], {n, 8}]
CROSSREFS
Sequence in context: A208143 A189265 A167239 * A173502 A223670 A189618
KEYWORD
nonn,more,hard
AUTHOR
STATUS
approved

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Last modified March 19 03:33 EDT 2024. Contains 370952 sequences. (Running on oeis4.)