47867domain: NAppears in sequencesNumbers whose base-4 representation contains exactly four 2's and four 3's.at n=17A045157Number of permutations of length n which avoid the patterns 1234, 2431, 3412.at n=13A116755Least m such that the Collatz (3x+1) iteration of m has exactly n increasing peak values.at n=23A221470