A125787 Main diagonal of table A125781.
1, 2, 8, 52, 433, 4276, 58017, 855463, 13670443, 235745794, 5122022952, 115172651558, 2700441900575, 66188170219650, 1696382503295129, 52131050479431445, 1631282413260019671, 52321326819923379190
Offset: 0