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A268633 as a simple table

na(n)
13
224
3120
4504
51944
67128
725272
887480
9297432
10997272
113306744
1210865016
1335429400
14114791256
15369882936
161186176312
173788111448
1812053081880
1938225488248
20120875192568
21381221761176
221199453833944
233765727153080

[3,24,120,504,1944,7128,25272,87480,297432,997272,
 3306744,10865016,35429400,114791256,369882936,
 1186176312,3788111448,12053081880,38225488248,
 120875192568,381221761176,1199453833944,
 3765727153080]