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A269618 as a simple table

na(n)
18
264
3512
44053
531822
6248143
71923796
814840928
9113998742
10872397577
116654286340
1250608816911
13383908730032
142905532655620
1521944295375268
16165426094919204
171244944198391978
189354631892435631
1970193014149728040

[8,64,512,4053,31822,248143,1923796,14840928,
 113998742,872397577,6654286340,50608816911,
 383908730032,2905532655620,21944295375268,
 165426094919204,1244944198391978,9354631892435631,
 70193014149728040]