# A034766 (b-file synthesized from sequence entry) 1 1 2 2 3 4 4 8 5 18 6 48 7 138 8 440 9 1440 10 4884 11 16806 12 58848 13 208024 14 743044 15 2674484 16 9695296 17 35357686 18 129646320 19 477638718 20 1767268112 21 6564120708 22 24466283836 23 91482563662 24 343059673408 25 1289904147400 26 4861946609488