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A037721 as a simple table

na(n)
12
218
3163
41470
513232
6119088
71071793
89646140
986815262
10781337358
117032036223
1263288326010
13569594934092
145126354406828
1546137189661453
16415234706953080
173737112362577722

[2,18,163,1470,13232,119088,1071793,9646140,
 86815262,781337358,7032036223,63288326010,
 569594934092,5126354406828,46137189661453,
 415234706953080,3737112362577722]