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A017718 as a simple table

n a(n)
54 1
55 55
56 1540
57 29260
58 424270
59 5006386
60 50063860
61 436270780
62 3381098545
63 23667689815
64 151473214816
65 895068996640
66 4922879481520
67 25371763481680
68 123234279768160
69 566877686933536
70 2480089880334220
71 10358022441395860

[1,55,1540,29260,424270,5006386,50063860,
 436270780,3381098545,23667689815,151473214816,
 895068996640,4922879481520,25371763481680,
 123234279768160,566877686933536,2480089880334220,
 10358022441395860]

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Last modified April 24 20:08 EDT 2024. Contains 371963 sequences. (Running on oeis4.)