# A153393 (b-file synthesized from sequence entry)
0 1
1 2
2 11
3 68
4 449
5 3102
6 22167
7 162626
8 1218411
9 9285888
10 71778489
11 561453704
12 4436120129
13 35354290118
14 283876985742
15 2294347190142
16 18650560232199
17 152386763938940
18 1250801705584643
19 10308949444236522
20 85281112255921359