A185623 Column 3 of triangular matrix T = A185620, which satisfies: T^3 - T^2 + I = SHIFT_LEFT(T).
1, 1, 7, 52, 442, 4345, 49114, 632104, 9167575, 148388893, 2657338636, 52244218837, 1120000171417, 26024217218746, 651943279016898, 17525338687574976, 503409841260165202, 15393623230236299133
Offset: 0