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A181306 as a simple table

na(n)
01
11
23
37
418
544
6110
7272
8676
91676
104160
1110320
1225608
1363536
14157648
15391152
16970528
172408064
185974880
1914824832
2036783296
2191266496
22226449920
23561866240
241394099328
253459031296
268582528768
2721294921472
2852836837888
29131098461184

[1,1,3,7,18,44,110,272,676,1676,4160,10320,25608,
 63536,157648,391152,970528,2408064,5974880,
 14824832,36783296,91266496,226449920,561866240,
 1394099328,3459031296,8582528768,21294921472,
 52836837888,131098461184]