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A261003 as a simple table

na(n)
01
12
25
315
448
5160
6549
71924
86851
924700
1089945
11330239
121220884
134540128
1416968958
1563701573
16240059998
17907760348
183443048256
1913094812968
2049925646786
21190772846082
22730451716847
232802033270234
2410767028435468
2541438212118088
26159711845145544
27616393788920923
282381898673172602

[1,2,5,15,48,160,549,1924,6851,24700,89945,330239,
 1220884,4540128,16968958,63701573,240059998,
 907760348,3443048256,13094812968,49925646786,
 190772846082,730451716847,2802033270234,
 10767028435468,41438212118088,159711845145544,
 616393788920923,2381898673172602]