# A097787 (b-file synthesized from sequence entry) 0 1 1 8 2 39 3 152 4 526 5 1704 6 5322 7 16296 8 49383 9 148864 10 447593 11 1344144 12 4034252 13 12105136 14 36318468 15 108959280 16 326882685 17 980654040 18 2941969435 19 8825917160 20 26477762106 21 79433298968 22 238299911854 23 714899753112 24 2144699279811