# A162807 (b-file synthesized from sequence entry) 0 1 1 21 2 420 3 8190 4 159600 5 3108210 6 60532290 7 1178845500 8 22957618110 9 447091673490 10 8706955895400 11 169564956368010 12 3302218915041690 13 64309571936658300 14 1252406684472377910 15 24390187277913766890