login

A000640 as a simple table

na(n)
00
11
24
313
442
5131
6402
71218
83657
910899
1032298
1195257
12279844
13819390
142392392
156967956
1620250974
1758744089
18170118980
19491913999
201420493862
214096940530
2211803172152
2333970257473
2497678027311
25280624328431
26805587723862

[0,1,4,13,42,131,402,1218,3657,10899,32298,95257,
 279844,819390,2392392,6967956,20250974,58744089,
 170118980,491913999,1420493862,4096940530,
 11803172152,33970257473,97678027311,280624328431,
 805587723862]