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A251594 as a simple table

na(n)
01
11
27
3240
421720
53371661
6753384764
7221280081152
88057098267140
934901583348508312
1017450751376913065040
119843352171270598267648
126153355867118768196316096
134203420758907186950461719325
143102284883642894954937435310820

[1,1,7,240,21720,3371661,753384764,221280081152,
 8057098267140,34901583348508312,
 17450751376913065040,9843352171270598267648,
 6153355867118768196316096,
 4203420758907186950461719325,
 3102284883642894954937435310820]