# A174120 (b-file synthesized from sequence entry) 1 1 2 2 3 2 4 1 5 1 6 8 7 36 8 115 9 307 10 738 11 1662 12 3589 13 7541 14 15564 15 31752 16 64295 17 129575 18 260358 19 522178 20 1046105 21 2094281 22 4190992 23 8384812 24 16772891 25 33549531 26 67103338 27 134211526 28 268428525 29 536863197 30 1073733268 31 2147474192