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A337291 as a simple table

na(n)
14
212
360
4364
52448
617556
7131560
81017900
98069424
1065204656
11535070172
124446927732
1337353738800
14316621743480
152704784196240
1623263187479980
17201275443944432
181750651680235920
1915298438066553776
20134252511729576240
211182622941581590080

[4,12,60,364,2448,17556,131560,1017900,8069424,
 65204656,535070172,4446927732,37353738800,
 316621743480,2704784196240,23263187479980,
 201275443944432,1750651680235920,
 15298438066553776,134252511729576240,
 1182622941581590080]