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A235455 as a simple table

na(n)
21
315
4181
51253
66044
722302
868661
9183645
10439578
11964938
121974128
133801457
146966581

[1,15,181,1253,6044,22302,68661,183645,439578,
 964938,1974128,3801457,6966581]