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A213723 as a simple table

na(n)
00
12
20
34
46
50
60
78
810
90
1012
1114
120
130
140
1516
1618
170
1820
1922
200
210
2224
2326
240
2528
2630
270
280
290
300
3132
3234
330
3436
3538
360
370
3840
3942
400
4144
4246
430
440
450
4648
4750
480
4952
5054
510
520
5356
5458
550
5660
5762
580
590
600
610
620
6364
6466
650
6668
6770
680
690
7072
7174
720
7376
7478

[0,2,0,4,6,0,0,8,10,0,12,14,0,0,0,16,18,0,20,22,0,
 0,24,26,0,28,30,0,0,0,0,32,34,0,36,38,0,0,40,42,0,
 44,46,0,0,0,48,50,0,52,54,0,0,56,58,0,60,62,0,0,0,
 0,0,64,66,0,68,70,0,0,72,74,0,76,78]