# A274860 (b-file synthesized from sequence entry) 0 1 1 1 2 2 3 4 4 8 5 16 6 32 7 68 8 144 9 304 10 692 11 1580 12 3602 13 8976 14 22552 15 56850 16 157740 17 442101 18 1249124 19 3868420 20 12082568 21 38117838 22 130394944 23 448733361 24 1559590892 25 5817284716 26 21787658638 27 82365982741 28 331668252301 29 1339477442569 30 5457855667219 31 23555837192320