# A281156 (b-file synthesized from sequence entry) 0 1 1 1 2 5 3 19 4 54 5 165 6 467 7 1317 8 3599 9 9687 10 25519 11 66203 12 169254 13 426750 14 1062950 15 2616818 16 6373911 17 15369774 18 36716706 19 86939235 20 204152395 21 475631501 22 1099874363 23 2525418842 24 5759549109 25 13050991205 26 29391523405 27 65801951770 28 146486952644 29 324340095729 30 714389015139