# A000634 (b-file synthesized from sequence entry) 2 1 3 2 4 6 5 14 6 38 7 97 8 260 9 688 10 1856 11 4994 12 13550 13 36791 14 100302 15 273824 16 749316 17 2053247 18 5635266 19 15484532 20 42599485 21 117312742 22 323373356 23 892139389 24 2463252315 25 6806148956 26 18818714543 27 52065725034 28 144135111504 29 399232819042 30 1106385615943