# A027333 (b-file synthesized from sequence entry) 0 1 1 3 2 18 3 65 4 230 5 783 6 2612 7 8573 8 27810 9 89386 10 285214 11 904671 12 2855438 13 8975432 14 28112778 15 87786759 16 273402138 17 849498192 18 2634067338 19 8152533735 20 25190812134 21 77722369419 22 239477564892 23 736972233435