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A363508 as a simple table

na(n)
01
15
220
380
4340
51516
67046
733736
8165436
9826566
104193348
1121542664
12111848161
13585949358
143093526496
1516442687695
1687914559018
17472522551440
182551591234444
1913836226412386
2075311992329508
21411336641019998
222253641429297336

[1,5,20,80,340,1516,7046,33736,165436,826566,
 4193348,21542664,111848161,585949358,3093526496,
 16442687695,87914559018,472522551440,
 2551591234444,13836226412386,75311992329508,
 411336641019998,2253641429297336]