# A055603 (b-file synthesized from sequence entry) 1 0 2 1 3 90 4 2248 5 43000 6 755100 7 13003620 8 226262400 9 4037765760 10 74481120000 11 1425927888000 12 28389466828800 13 588245898240000 14 12685887076262400 15 284623499160000000 16 6639289429893120000 17 160886197351047168000 18 4046412223559946240000 19 105527367894862577664000