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A149877 as a simple table

na(n)
01
12
25
314
442
5140
6480
71694
86160
922768
1086119
11329819
121276827
135009624
1419807663
1579034687
16317771172
171284909978
185231953571
1921409625876
2088032238475
21363768052841
221508700015910
236282877542186
2426257507524764
25110071406730840
26462949380985458
271952358638292573
288255507414702459

[1,2,5,14,42,140,480,1694,6160,22768,86119,329819,
 1276827,5009624,19807663,79034687,317771172,
 1284909978,5231953571,21409625876,88032238475,
 363768052841,1508700015910,6282877542186,
 26257507524764,110071406730840,462949380985458,
 1952358638292573,8255507414702459]