# A189334 (b-file synthesized from sequence entry) 0 1 1 4 2 36 3 340 4 3220 5 30500 6 288900 7 2736500 8 25920500 9 245522500 10 2325622500 11 22028612500 12 208658012500 13 1976437062500 14 18721080562500 15 177328620312500 16 1679680800312500 17 15910164901562500 18 150703245014062500 19 1427481625632812500