110328domain: NAppears in sequencesConvolution square of A285349.at n=41A285350Number of 5-tuples of nonnegative integers less than p for which 5-argument multinomial coefficients support a Lucas congruence modulo p^2, where p is the n-th prime.at n=4A348887a(n) = Sum_{k=0..floor(n/3)} 2^k * Stirling2(n,3*k).at n=10A357782