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A249657 as a simple table

na(n)
12
253
3164
4485
51046
62077
73708
86149
99610
1014441
1120832
1229173
1339794
1453105
1569476
1689417
17113318
18141769
19175260
20214361
21259642
22311813
23371424
24439225
25515906
26602237
27698948
28806909
29926870
301059781
311206492
321367933
331545034

[2,53,164,485,1046,2077,3708,6149,9610,14441,
 20832,29173,39794,53105,69476,89417,113318,141769,
 175260,214361,259642,311813,371424,439225,515906,
 602237,698948,806909,926870,1059781,1206492,
 1367933,1545034]