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A001680 as a simple table

na(n)
01
11
22
35
414
546
6166
7652
82780
912644
1061136
11312676
121680592
139467680
1455704104
15341185496
162170853456
1714314313872
1897620050080
19687418278544
204989946902176
2137286121988256
22286432845428192
232259405263572480
2418280749571449664
25151561941235370176

[1,1,2,5,14,46,166,652,2780,12644,61136,312676,
 1680592,9467680,55704104,341185496,2170853456,
 14314313872,97620050080,687418278544,
 4989946902176,37286121988256,286432845428192,
 2259405263572480,18280749571449664,
 151561941235370176]