# A113979 (b-file synthesized from sequence entry) 0 1 1 0 2 2 3 1 4 6 5 6 6 20 7 28 8 72 9 120 10 272 11 496 12 1056 13 2016 14 4160 15 8128 16 16512 17 32640 18 65792 19 130816 20 262656 21 523776 22 1049600 23 2096128 24 4196352 25 8386560 26 16781312 27 33550336 28 67117056 29 134209536 30 268451840 31 536854528 32 1073774592 33 2147450880