# A274763 (b-file synthesized from sequence entry)
1 1
2 10
3 215
4 7200
5 328090
6 18914190
7 1318595475
8 107813147200
9 10112867995550
10 1070215246700100
11 126122386636230950
12 16378717184245443000
13 2323753119238888045500
14 357594668486650175355750
15 59323244552378848484536875
16 10553747415214416889115286000
17 2004246729406751177924041663750
18 404685181230584369889138573637500
19 86569650968075614116679243211951250
20 19558042902565983702641321883519060000