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A280836 as a simple table

na(n)
01
12
26
31
416
547
6112
715
8464
9239
101120
112591
127424
131791
1425344
154351
1675008
17151295
18296448
19598527
201200128
212420735
224730880
239637887
2419156992
2538465535
2677488128
27153100287
28307560448
29620691455
301229127680
312477850623
324861526016
339842917375

[1,2,6,1,16,47,112,15,464,239,1120,2591,7424,1791,
 25344,4351,75008,151295,296448,598527,1200128,
 2420735,4730880,9637887,19156992,38465535,
 77488128,153100287,307560448,620691455,1229127680,
 2477850623,4861526016,9842917375]