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A002999 as a simple table

na(n)
01
12
26
318
456
5170
6492
71358
83600
99234
1023060
1156342
12135192
13319514
14745500
151720350
163932192
178912930
1820054052
1944826662
2099614760
21220201002
22484442156
231061158958
242315255856
255033164850
2610905190452
2723555211318
2850734301240
29108984795194

[1,2,6,18,56,170,492,1358,3600,9234,23060,56342,
 135192,319514,745500,1720350,3932192,8912930,
 20054052,44826662,99614760,220201002,484442156,
 1061158958,2315255856,5033164850,10905190452,
 23555211318,50734301240,108984795194]