321991domain: NPropertiesPrimalityPrimeyesAppears in sequencesa(n) = a(n-1) + a(n-2) + 1, with a(0) = 1 and a(1) = 9.at n=23A022323Number of multisets of positive integers whose right half (exclusive) sums to n.at n=38A360673Prime numbersat n=27767