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A143002 as a simple table

na(n)
00
11
221
3751
438500
52617756
6225629712
723924915568
83053853073152
9461404969871616
1081403191005875200
1116580318776579814400
123861255442546368921600
131019529192596773592678400

[0,1,21,751,38500,2617756,225629712,23924915568,
 3053853073152,461404969871616,81403191005875200,
 16580318776579814400,3861255442546368921600,
 1019529192596773592678400]