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A251480 as a simple table

na(n)
1218854
22696488
330592799
4261990105
52095872247
613874159417
787400242458
8484930994600
92598001207593
1012731552201785
1160866054904554
12272632467747110

[218854,2696488,30592799,261990105,2095872247,
 13874159417,87400242458,484930994600,
 2598001207593,12731552201785,60866054904554,
 272632467747110]