OFFSET
1,1
COMMENTS
The number of unordered bases of a (F_p)-vector space of dimension 2, p prime.
LINKS
Mark Herman, Jonathan Pakianathan, Ergun Yalcin, On a canonical construction of tesselated surfaces via finite group theory, Part I, arXiv:1310.3848v1 [math.GT], Oct 14, 2013, see p.34.
FORMULA
(p^2 -1)*(p^2 - p)/2 for p = 2, 3, 5, 7, 11, 13... for p = prime(n).
EXAMPLE
a(25) = (p^2 -1)*(p^2 - p)/2 for p = prime(25) = (97^2 -1)*(97^2 - 97)/2 = 43803648.
MATHEMATICA
Table[p = Prime[n]; (p^2 - 1)*(p^2 - p)/2, {n, 50}] (* T. D. Noe, Oct 18 2013 *)
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Jonathan Vos Post, Oct 16 2013
STATUS
approved