# A023422 (b-file synthesized from sequence entry) 0 1 1 1 2 1 3 1 4 1 5 1 6 2 7 4 8 8 9 16 10 32 11 64 12 129 13 261 14 530 15 1080 16 2208 17 4528 18 9313 19 19207 20 39714 21 82314 22 170996 23 355976 24 742545 25 1551817 26 3248823 27 6812947 28 14309557 29 30099645 30 63402315