# A217778 (b-file synthesized from sequence entry) 0 1 1 3 2 10 3 34 4 117 5 407 6 1429 7 5055 8 17986 9 64278 10 230473 11 828391 12 2982825 13 10754459 14 38811802 15 140165322 16 506449789 17 1830590295 18 6618524221 19 23933966743 20 86562282258 21 313102489406 22 1132598701585 23 4097213146599 24 14822370816337 25 53623952036787