-67106880

Appears in sequences

• a(n) = 6*5*4*3*2*1 - 12*11*10*9*8*7 + 18*17*16*15*14*13 - 24*23*22*21*20*19 + ... - (up to the n-th term).at n=28A319889
• Dirichlet inverse of A011782, 2^(n-1).at n=26A349452