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A261602 as a simple table

na(n)
11
21
34
48
510
68
74
8216
9648
101188
111668
121944
131944
141668
151188
16648
17216
18331776
191327104
203151872
215695488
228608896
2311446272
2413791744
2515326208
2615858432
2715326208
2813791744
2911446272
308608896
315695488
323151872
331327104
34331776
3524883200000
36124416000000
37360806400000
38787138560000
391426595328000
402262299258880
413240594432000
424283587584000
435304730521600
446222411878400
456968709089280
467493189990400
477763310604800

[1,1,4,8,10,8,4,216,648,1188,1668,1944,1944,1668,
 1188,648,216,331776,1327104,3151872,5695488,
 8608896,11446272,13791744,15326208,15858432,
 15326208,13791744,11446272,8608896,5695488,
 3151872,1327104,331776,24883200000,124416000000,
 360806400000,787138560000,1426595328000,
 2262299258880,3240594432000,4283587584000,
 5304730521600,6222411878400,6968709089280,
 7493189990400,7763310604800]