# A011957 (b-file synthesized from sequence entry) 1 0 2 1 3 1 4 1 5 1 6 2 7 3 8 6 9 10 10 18 11 31 12 59 13 105 14 198 15 365 16 688 17 1285 18 2438 19 4599 20 8755 21 16647 22 31806 23 60787 24 116570 25 223696 26 430290 27 828514 28 1598025 29 3085465 30 5965612 31 11545611 32 22370304 33 43383539 34 84216330 35 163617801 36 318148208 37 619094385 38 1205609454 39 2349383925 40 4581307186 41 8939118925 42 17452582356