login

A013991 as a simple table

na(n)
01
11
24
316
472
5335
61562
77273
833850
9157534
10733148
113412005
1215879172
1373900265
14343925312
151600598044
167449042040
1734667184251
18161338016046
19750852888177
203494403076902
2116262643529850
2275684907767980
23352230881365025
241639251436594792
257628931517771089

[1,1,4,16,72,335,1562,7273,33850,157534,733148,
 3412005,15879172,73900265,343925312,1600598044,
 7449042040,34667184251,161338016046,750852888177,
 3494403076902,16262643529850,75684907767980,
 352230881365025,1639251436594792,7628931517771089]