258772

Appears in sequences

• Combinatorial twin prime formulas. This sequence gives the coefficients a(n) of combinatorial sum formulas of n-th twin primes or lesser: twin_prime(n) = 2^(n-6)/(n-1)! Sum_{i=1..n} a(i) * C(n-1,i-1) * (i+2-n).at n=9A119362
• Number of integer compositions of n into parts that are alternately unequal and equal.at n=42A357644