48814981614domain: NAppears in sequencesa(n) = Sum_{k=0..2n} (k+1) * A025177(n, k).at n=20A027261Number of permutations of 2 indistinguishable copies of 1..n arranged in a circle with exactly 1 local maximum.at n=19A159715Numbers of multiplicative persistence 6 which are themselves the product of digits of a number.at n=8A350185