# A036661 (b-file synthesized from sequence entry) 0 1 1 1 2 2 3 4 4 8 5 15 6 32 7 66 8 142 9 306 10 672 11 1483 12 3316 13 7446 14 16859 15 38353 16 87735 17 201510 18 464801 19 1075744 20 2498053 21 5817576 22 13585231 23 31801732 24 74615404 25 175433624 26 413281276 27 975355639 28 2305763635 29 5459480822 30 12945857671