-6961

Appears in sequences

• Expansion of 1/(1+x+x^2-2*x^3).at n=21A077975
• a(n) = (n^6 - 126*n^5 + 6217*n^4 - 153066*n^3 + 1987786*n^2 - 13055316*n + 34747236)/36.at n=17A121888