# A049188 (b-file synthesized from sequence entry) 1 1 2 1 3 3 4 9 5 31 6 113 7 429 8 1679 9 6719 10 27367 11 113053 12 472471 13 1993785 14 8483023 15 36348595 16 156705421 17 679218965 18 2957961685 19 12936141935 20 56787742645 21 250137441355 22 1105189823717 23 4896749876081 24 21751355833739