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A284193 as a simple table

na(n)
12
24
313
440
5131
6455
71611
85818
921328
1078965
11294721
121107257
134182655
1415873631
1560485153
16231287810
17887184904
183412621088
1913159857176
2050862414259
21196984720481
22764321821293
232970680947542
2411563991293971
2545079009826426

[2,4,13,40,131,455,1611,5818,21328,78965,294721,
 1107257,4182655,15873631,60485153,231287810,
 887184904,3412621088,13159857176,50862414259,
 196984720481,764321821293,2970680947542,
 11563991293971,45079009826426]