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A251596 as a simple table

na(n)
01
10
21
30
45
51
670
7106
82380
912398
10184359
111830820
1225990371
13348029255
14531547931
1583340599734
161395460803100
1724298184539132
18442299791441900
198348538362127894
20163180897579795284

[1,0,1,0,5,1,70,106,2380,12398,184359,1830820,
 25990371,348029255,531547931,83340599734,
 1395460803100,24298184539132,442299791441900,
 8348538362127894,163180897579795284]