# A001131 (b-file synthesized from sequence entry) 0 0 1 1 2 2 3 2 4 3 5 8 6 14 7 20 8 35 9 64 10 122 11 260 12 586 13 1296 14 2708 15 5400 16 10468 17 19888 18 37580 19 71960 20 140612 21 279264 22 560544 23 1133760 24 2310316 25 4750368 26 9876264 27 20788880 28 44282696 29 95241664 30 206150208 31 447470464 32 970862029 33 2100029344