3095708domain: NAppears in sequencesNumber of permutations of [n] containing exactly 2 increasing subsequences of length 3.at n=13A001089Iccanobirt numbers (5 of 15): a(n) = R(a(n-1)) + a(n-2) + R(a(n-3)), where R is the digit reversal function A004086.at n=22A102115