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A153338 as a simple table

na(n)
10
22
318
4116
5650
63372
716660
879592
9371034
101697660
117654460
1234106712
13150499908
14658707896
152863150440
1612371226064
1753178791162
18227561427612
19969890051884
204119092850680
2117438036501676
2273611934643368
23309935825654168
241301878616066736

[0,2,18,116,650,3372,16660,79592,371034,1697660,
 7654460,34106712,150499908,658707896,2863150440,
 12371226064,53178791162,227561427612,969890051884,
 4119092850680,17438036501676,73611934643368,
 309935825654168,1301878616066736]