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A269434 as a simple table

na(n)
18
264
3512
44068
532152
6252932
71981512
815465934
9120310016
10933059856
117216323640
1255670133422
13428465939112
143290601897928
1525221303496496
16192953793764769
171473623863797808
1811236105478130612
1985542959337048488

[8,64,512,4068,32152,252932,1981512,15465934,
 120310016,933059856,7216323640,55670133422,
 428465939112,3290601897928,25221303496496,
 192953793764769,1473623863797808,
 11236105478130612,85542959337048488]