# A045474 (b-file synthesized from sequence entry) 1 4 2 8 3 14 4 24 5 42 6 76 7 138 8 254 9 470 10 876 11 1638 12 3070 13 5766 14 10850 15 20436 16 38550 17 72806 18 137670 19 260612 20 493824 21 936690 22 1778360 23 3379372 24 6427190 25 12232928 26 23300652 27 44414366 28 84713872 29 161686324 30 308780220