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A083337 as a simple table

na(n)
00
13
26
318
448
5132
6360
7984
82688
97344
1020064
1154816
12149760
13409152
141117824
153053952
168343552
1722795008
1862277120
19170144256
20464842752
211269974016
223469633536
239479215104
2425897697280
2570753824768
26193303044096
27528113737728
281442833563648
293941894602752
3010769456332800

[0,3,6,18,48,132,360,984,2688,7344,20064,54816,
 149760,409152,1117824,3053952,8343552,22795008,
 62277120,170144256,464842752,1269974016,
 3469633536,9479215104,25897697280,70753824768,
 193303044096,528113737728,1442833563648,
 3941894602752,10769456332800]