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A014448 as a simple table

na(n)
02
14
218
376
4322
51364
65778
724476
8103682
9439204
101860498
117881196
1233385282
13141422324
14599074578
152537720636
1610749957122
1745537549124
18192900153618
19817138163596
203461452808002
2114662949395604
2262113250390418

[2,4,18,76,322,1364,5778,24476,103682,439204,
 1860498,7881196,33385282,141422324,599074578,
 2537720636,10749957122,45537549124,192900153618,
 817138163596,3461452808002,14662949395604,
 62113250390418]