login

A087503 as a simple table

na(n)
01
13
26
312
421
539
666
7120
8201
9363
10606
111092
121821
133279
145466
159840
1616401
1729523
1849206
1988572
20147621
21265719
22442866
23797160
241328601
252391483
263985806
277174452
2811957421
2921523359
3035872266
3164570080
32107616801
33193710243

[1,3,6,12,21,39,66,120,201,363,606,1092,1821,3279,
 5466,9840,16401,29523,49206,88572,147621,265719,
 442866,797160,1328601,2391483,3985806,7174452,
 11957421,21523359,35872266,64570080,107616801,
 193710243]