# A121136 (b-file synthesized from sequence entry) 4 1 5 3 6 13 7 45 8 164 9 527 10 1652 11 4876 12 14000 13 38800 14 105112 15 278104 16 722736 17 1846320 18 4650368 19 11560320 20 28413312 21 69111168 22 166551680 23 397975680 24 943672576 25 2221821184 26 5197313024 27 12084884480 28 27944656896 29 64286203904 30 147182565376