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A054888 as a simple table

na(n)
01
15
215
340
4105
5275
6720
71885
84935
912920
1033825
1188555
12231840
13606965
141589055
154160200
1610891545
1728514435
1874651760
19195440845
20511670775
211339571480
223507043665
239181559515
2424037634880
2562931345125

[1,5,15,40,105,275,720,1885,4935,12920,33825,
 88555,231840,606965,1589055,4160200,10891545,
 28514435,74651760,195440845,511670775,1339571480,
 3507043665,9181559515,24037634880,62931345125]