Python 3, ppperry, A000027 -> A004526
f=lambda a,n=((int("A004526",11)-0x103519a)%100%30+1)/2:a//(14-n)
Try it online! (prints first few terms of both. Note the two sequences have offsets of 1 and 0 respectively, so the first has a leading zero - it threw me a little!)