# A372464 (b-file synthesized from sequence entry)
0 1
1 4
2 32
3 286
4 2688
5 26004
6 256334
7 2560352
8 25824768
9 262447684
10 2683152032
11 27565067600
12 284330359950
13 2942808943572
14 30546407611136
15 317867390671536
16 3314979452815360
17 34637849797078380
18 362544825234198020
19 3800439733237986800
20 39893311092729794688