171786

Appears in sequences

• a(n)=(n^5-n-30)/30.at n=22A131211
• The number of conjugacy classes of invertible n X n matrices over GF(2) which are squares of other such matrices.at n=18A266462
• Sphenic numbers that are sandwiched between products of exactly 4 distinct primes (or tetraprimes).at n=20A375908
• a(n) = (1/4) * Sum_{k=0..floor(n/3)} (n-2*k+2) * binomial(2*n-4*k+2,2*k+1).at n=14A391831