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A087433 as a simple table

na(n)
01
12
26
320
470
5252
6926
73460
813110
950252
10194446
11758100
122973350
1311716252
1446333566
15183739940
16730176790
172906358252
1811582386286
1946200404980
20184414199430
21736494536252
222942491360606
2311759505089220
2447006639297270

[1,2,6,20,70,252,926,3460,13110,50252,194446,
 758100,2973350,11716252,46333566,183739940,
 730176790,2906358252,11582386286,46200404980,
 184414199430,736494536252,2942491360606,
 11759505089220,47006639297270]