# A176778 (b-file synthesized from sequence entry) 0 1 1 -1 2 -4 3 -7 4 -8 5 -3 6 16 7 65 8 176 9 413 10 904 11 1905 12 3928 13 7997 14 16160 15 32513 16 65248 17 130749 18 261784 19 523889 20 1048136 21 2096669 22 4193776 23 8388033 24 16776592 25 33553757 26 67108136 27 134216945 28 268434616 29 536870013 30 1073740864 31 2147482625