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A138413 as a simple table

na(n)
00
10
22
318
4186
52120
625724
7325878
84260282
957048048
10778483932
1110786724388
12151355847012
132146336125648
1430711521221376
15442862000693438
166429286894263738
1793891870710425440
181378379704593824300
1920330047491994213884
20301111732041234778316
214476705468260134734384
2266784808491631598524136

[0,0,2,18,186,2120,25724,325878,4260282,57048048,
 778483932,10786724388,151355847012,2146336125648,
 30711521221376,442862000693438,6429286894263738,
 93891870710425440,1378379704593824300,
 20330047491994213884,301111732041234778316,
 4476705468260134734384,66784808491631598524136]