44394domain: NAppears in sequencesFibonacci sequence beginning 1, 10.at n=19A022100Index of Mersenne number A000225 that is also Mersenne prime A000668, minus n-th prime: a(n) = A000043(n) - A000040(n).at n=26A153801Number of subwords of the form UUUD in nondecreasing Dyck paths of length 2n.at n=12A377857