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A151478 as a simple table

na(n)
01
11
24
312
454
5210
61020
74445
822610
9105210
10551376
112678676
1214332164
1371788860
14389991888
151998530820
1610984120290
1757293297490
18317798892840
191681213457352
209395215622364
2150278804820244
22282711201927336
231527524202392370
248633634028624332
2547028406025950300
26266981514041485600

[1,1,4,12,54,210,1020,4445,22610,105210,551376,
 2678676,14332164,71788860,389991888,1998530820,
 10984120290,57293297490,317798892840,
 1681213457352,9395215622364,50278804820244,
 282711201927336,1527524202392370,8633634028624332,
 47028406025950300,266981514041485600]