167050domain: NAppears in sequencesa(n) = (11*n + 4)*C(n+3, 3)/4.at n=23A055268Number of permutations of length n which avoid the patterns 1234, 2431, 4312.at n=22A116765Expansion of 1/( 1 - Sum_{k>=0} x^(5^k) / (1 - x^(5^k)) ).at n=18A382373