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A151481 as a simple table

na(n)
01
11
24
313
457
5236
61106
75136
825112
9123604
10624229
113181337
1216456910
1385845734
14452215297
152398829267
1612815000375
1768850087543
18371908087035
192018269612417
2010999942891088
2160181126016328
22330414426742222
231819877327401550
2410053145748429452
2555684213462489305
26309204003830794592

[1,1,4,13,57,236,1106,5136,25112,123604,624229,
 3181337,16456910,85845734,452215297,2398829267,
 12815000375,68850087543,371908087035,
 2018269612417,10999942891088,60181126016328,
 330414426742222,1819877327401550,
 10053145748429452,55684213462489305,
 309204003830794592]