We counted to 15 in Norwegian, let's keep going!
16 seksten - sounds like sah-ee-s-t-n
17 sytten - sounds like suh-t-n
18 atten - sounds like ah-t-n
19 nitten - sounds like nee-t-n
20 tjue - sounds like shoo-ah
(from: wikipedia - norwegian language)
Greek: δεκαέξι (dekaéxi), δεκαεπτά (dekaeptá), δεκαοχτώ (dekaochtó), δεκαεννέα (dekaennéa), είκοσι (eíkosi)
ASL: sixteen, seventeen, eighteen, nineteen, twenty
Italian: sedici, diciassette, diciotto, diciannove, venti
German: sechzehn, siebzehn, achtzehn, neunzehn, zwanzig
Spanish: dieciséis, diecisiete, dieciocho, diecinueve, veinte
French: seize, dix-sept, dix-huit, dix-neuf, vingt