# A356715 (b-file synthesized from sequence entry) 0 1 1 2 2 3 3 6 4 11 5 26 6 68 7 177 8 492 9 1403 10 4113 11 12149 12 36225 13 108268 14 324529 15 973163 16 2920533 17 8764041 18 26303715 19 78935398 20 236878491 21 710783343