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A251464 as a simple table

na(n)
15926
238509
3239572
41125843
55145888
619854533
775006354
8255126617
9853011914
102668157253
118219717614
1224279045133
1370676062040
14200592222675
15560962999717
161547846775013
174205200806698
1811371630681863
1930246462359503

[5926,38509,239572,1125843,5145888,19854533,
 75006354,255126617,853011914,2668157253,
 8219717614,24279045133,70676062040,200592222675,
 560962999717,1547846775013,4205200806698,
 11371630681863,30246462359503]