OFFSET
1,2
LINKS
Harry J. Smith, Table of n, a(n) for n = 1..100
Romeo Meštrović, Wolstenholme's theorem: Its Generalizations and Extensions in the last hundred and fifty years (1862-2011), arXiv preprint arXiv:1111.3057 [math.NT], 2011.
FORMULA
a(n+1) = C(A005563(n), n) for n >= 0. - Fred Daniel Kline, Sep 27 2016
From Peter Bala, Oct 22 2023: (Start)
a(p^r) == 1 (mod p^(3+r)) for all positive integers r and all primes p >= 5 (apply Meštrović, Remark 17, p. 12).
Conjecture: a(2*p^r) == 4*p^r - 1 (mod p^(3+r)) for all positive integers r and all primes p >= 5. (End)
MAPLE
MATHEMATICA
Table[Binomial[n^2, n]/n, {n, 15}] (* Michael De Vlieger, Sep 28 2016 *)
PROG
(PARI) a(n) = binomial(n^2, n)/n; \\ Harry J. Smith, Jul 06 2009
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Henry Bottomley, Apr 02 2001
EXTENSIONS
More terms from Fred Daniel Kline, Sep 28 2016
STATUS
approved