1, 2, 7, 21, 93, 334, 1536, 5867, 28047, 112618, 542814, 2233452, 10915934, 45965645, 225308120, 961377360, 4743469916, 20511319674, 101331875971, 441859544548, 2190789707577, 9635965245969, 47806098871455, 211501235721331, 1051569451113436, 4680667747964805, 23279726523079784, 104070299439210842