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A177398 as a simple table

na(n)
01
14
216
364
4208
5656
61984
75632
815520
941476
10107312
11271232
12670464
131622160
143854208
159003264
1620696640
1746895248
18104827472
19231353984
20504592448
211088323584
222322683072
234908033280
2410273819136
2521313971876
2643843093488

[1,4,16,64,208,656,1984,5632,15520,41476,107312,
 271232,670464,1622160,3854208,9003264,20696640,
 46895248,104827472,231353984,504592448,1088323584,
 2322683072,4908033280,10273819136,21313971876,
 43843093488]