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A291406 as a simple table

na(n)
00
11
22
34
412
526
660
7145
8336
9796
101880
114412
1210400
1324488
1457648
15135794
16319744
17752908
181773016
194175032
209831472
2123151400
2254516976
23128377380
24302304640
25711870368
261676321856
273947423264
289295440640
2921889019712
3051544533376
31121377706184

[0,1,2,4,12,26,60,145,336,796,1880,4412,10400,
 24488,57648,135794,319744,752908,1773016,4175032,
 9831472,23151400,54516976,128377380,302304640,
 711870368,1676321856,3947423264,9295440640,
 21889019712,51544533376,121377706184]