47684

Appears in sequences

• a(n) = n*(2*n^2 - 3*n + 4)/3.at n=42A037235
• Numbers k such that k-th and (k+1)-st term of A038593 differ by 3.at n=33A038634
• Indices where 2 occurs in A124151.at n=26A124401
• Numbers k such that 1 + Sum_{i=1..k} 2^(2*i-1) is prime.at n=31A127936
• a(n) = 225*n^2 - 199*n + 44.at n=15A156812
• Number T(n,k) of ways to place k nonattacking knights on an n X n board; triangle T(n,k), n>=0, 0<=k<=A030978(n), read by rows.at n=50A244081
• Numbers n such that n and n+1 both have 24 divisors.at n=26A274362
• Numbers k such that k and k+1 both have the prime signature (2,1,1,1) (A189982).at n=12A336658
• Expansion of Sum_{k>=0} (k * x * (1 + x^2))^k.at n=6A360727