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A037131 as a simple table

na(n)
00
11
26
328
4120
5497
62016
78140
832640
9130813
10523776
112096133
128386580
1333550335
14134209524
15536854528
162147450887
178589869054
1834359607310
19137438691321
20549755289604
212199022206975
228796090925052
2335184367894531
24140737479966709
25562949936644106

[0,1,6,28,120,497,2016,8140,32640,130813,523776,
 2096133,8386580,33550335,134209524,536854528,
 2147450887,8589869054,34359607310,137438691321,
 549755289604,2199022206975,8796090925052,
 35184367894531,140737479966709,562949936644106]