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A049308 as a simple table

na(n)
01
14
240
3640
414080
5394240
613404160
7536166400
824663654400
91282510028800
1074385581670400
114760677226905600
12333247405883392000
1325326802847137792000
142076797833465298944000
15182758209344946307072000
1617179271678424952864768000
171717927167842495286476800000

[1,4,40,640,14080,394240,13404160,536166400,
 24663654400,1282510028800,74385581670400,
 4760677226905600,333247405883392000,
 25326802847137792000,2076797833465298944000,
 182758209344946307072000,
 17179271678424952864768000,
 1717927167842495286476800000]