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A135803 as a simple table

na(n)
01
10
20
356
4126
52016
616632
7181368
82091375
926442416
10361224864
115305691664
1283351722636
131394398680192
1424744942004464
15464237094657744
169179911341932877
17190814604739422048
184159156093506930208

[1,0,0,56,126,2016,16632,181368,2091375,26442416,
 361224864,5305691664,83351722636,1394398680192,
 24744942004464,464237094657744,9179911341932877,
 190814604739422048,4159156093506930208]