# A151275 (b-file synthesized from sequence entry) 0 1 1 1 2 5 3 13 4 61 5 199 6 939 7 3389 8 16129 9 61601 10 295373 11 1169939 12 5643023 13 22931063 14 111114587 15 460242509 16 2238229577 17 9409963861 18 45894616065 19 195273012089 20 954636984885 21 4102002557665 22 20092702499037 23 87052952678691 24 427107841926791 25 1863539746958059 26 9155858788887359 27 40191781253867359