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A220874 as a simple table

na(n)
01
12
26
320
464
5194
6562
71570
84258
911266
1029186
1174242
12185858
13458754
141118210
152695170
166430722
1715204354
1835651586
1982968578
20191758338
21440401922
221005584386
232283798530
245161091074
2511609833474
2626004684802
2758015612930
28128949682178

[1,2,6,20,64,194,562,1570,4258,11266,29186,74242,
 185858,458754,1118210,2695170,6430722,15204354,
 35651586,82968578,191758338,440401922,1005584386,
 2283798530,5161091074,11609833474,26004684802,
 58015612930,128949682178]