A174356 (-1)^(n+1)*n*A174276(n).

0, 2, -12, 90, -280, 1050, -13860, 70070, -48048, 4594590, -4618900, 106696590, -382444920, 966735770, -3123300180, 97045398450, -97241449760, 3409528332210, -3610088822340, 9399601637426, -13492251154200

Offset: 0

Author

Paul Curtz, Mar 17 2010

Keywords

• frac
• sign
• easy

Comments

The sequence obeys a(n) = A174289(n) - A174290(n), a formula that might be compared to A164869(n) = n*A027642(n) = A164558(n)-A164555(n).