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A113990 as a simple table

na(n)
01
14
212
336
4116
5416
61680
77656
839256
9225348
101439868
1110179116
1279153484
13673262240
146231517920
1562461031920
16675005395152
177832909636740
1897238472215564
191286967352638292
2018102901048062404
21269852768731391808

[1,4,12,36,116,416,1680,7656,39256,225348,1439868,
 10179116,79153484,673262240,6231517920,
 62461031920,675005395152,7832909636740,
 97238472215564,1286967352638292,18102901048062404,
 269852768731391808]