# A005959 (b-file synthesized from sequence entry) 2 1 3 1 4 4 5 6 6 18 7 42 8 118 9 314 10 895 11 2521 12 7307 13 21238 14 62566 15 185310 16 553288 17 1660490 18 5011299 19 15190665 20 46244031 21 141296042 22 433204573 23 1332261200 24 4108833222 25 12704949506 26 39379343929 27 122327632914 28 380778749899 29 1187544117426