# A005724 (b-file synthesized from sequence entry)
1 3
2 40
3 546
4 7728
5 112035
6 1650792
7 24608948
8 370084832
9 5603730876
10 85316186400
11 1304770191802
12 20029132137840
13 308437355259930
14 4762695514958640
15 73716196036213800
16 1143325208566357440
17 17765127399780725316
18 276484586847524844768
19 4309270265307160983144