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A000470 as a simple table

na(n)
513
672
7595
84096
939078
10379760
114181826
1249916448
13647070333
149035216428
15135236990388
162159812592384
1736658601139066
18658942295734944
1912504663617290908
20249823152134646144
215241223014084306270
22115206851288747267148
232647678812396326064043

[13,72,595,4096,39078,379760,4181826,49916448,
 647070333,9035216428,135236990388,2159812592384,
 36658601139066,658942295734944,12504663617290908,
 249823152134646144,5241223014084306270,
 115206851288747267148,2647678812396326064043]