# A150029 (b-file synthesized from sequence entry) 0 1 1 2 2 6 3 16 4 56 5 176 6 632 7 2080 8 7744 9 26752 10 100352 11 353024 12 1345280 13 4843008 14 18516864 15 67305984 16 259601408 17 956426240 18 3695605760 19 13696663552 20 53218287616 21 198990118912 22 774023897088 23 2905880100864 24 11346564612096 25 42864799645696 26 167495532347392 27 634607654010880 28 2486700816072704