# A181893 (b-file synthesized from sequence entry) 1 1 2 1 3 1 4 3 5 7 6 16 7 34 8 70 9 130 10 235 11 445 12 769 13 1417 14 2497 15 4177 16 6529 17 11233 18 17713 19 30673 20 49033 21 76233 22 119433 23 205833 24 316713 25 471945 26 715881 27 1026345 28 1449705 29 2296425 30 3376425 31 5536425 32 8128425 33 11814825 34 17528745 35 25242537 36 34480425 37 52956201 38 81509673