-2676

Appears in sequences

• Expansion of (1-x)^(-1)/(1+x+x^2-2*x^3).at n=19A077907
• a(n) = 3*2*1 - 6*5*4 + 9*8*7 - 12*11*10 + 15*14*13 - 18*17*16 + ... - (up to the n-th term).at n=19A319886