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A337961 as a simple table

na(n)
10
214
33720
4132184
51987720
617935806
7114638048
8570597216
92348263008
108320953630
1126126986952
1274247445272
13194049316552
14472265688622
151080900468480
162345089916288
174854316187136
189638888023278
1918442173583176

[0,14,3720,132184,1987720,17935806,114638048,
 570597216,2348263008,8320953630,26126986952,
 74247445272,194049316552,472265688622,
 1080900468480,2345089916288,4854316187136,
 9638888023278,18442173583176]