7153575domain: NAppears in sequencesAlkane (or paraffin) numbers l(12,n).at n=21A018213One half of binomial coefficients binomial(2*n-8,9).at n=10A053133Number of 9-element subsets of [n+9] having an even sum.at n=21A282077Number of n-element subsets of [n+9] having an even sum.at n=21A282085