A207322 a(n) = Sum{k=0..n} (-1)^k*A002893(k).
0, -3, 12, -81, 558, -4095, 31074, -241761, 1915998, -15403839, 125264226, -1028198769, 8505440256, -70821126339, 593013903996, -4989710564097, 42162715062462, -357607035133503, 3043168538309586, -25973801534610801, 222282241838388288, -1906876619917171299, 16394307639893817516, -141231930366941378721
Offset: 0