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Recurrence:
a(1) = 24,
a(2) = 6048,
a(3) = 1431936,
a(4) = 326820576,
a(5) = 74610584016,
a(6) = 17042758679136,
a(7) = 3892782584508480,
a(8) = 889156265863827264,
a(9) = 203093678317841507424,
a(10) = 46388970280261506291456,
a(11) = 10595782951389630699006144,
a(12) = 2420200657566556505910445056,
a(13) = 552802114842508189665069539328,
a(14) = 126266463574145216525332543882752,
a(15) = 28840735944058922301478239666093696,
a(16) = 6587561148465308380773642743145878016,
a(17) = 1504675954488241136540734409327760801024,
a(18) = 343685573004895910322683065681242613824000,
a(19) = 78501801493782514393269579891334793783725056,
a(20) = 17930728904007407186715098489007832537944898560,
a(21) = 4095588036339152450673664069192988041090603630080,
a(22) = 935480172234132922409579369697482180561394428018688,
a(23) = 213674604202973780616456330975690211137136284005071872,
a(24) = 48805776794027507492059897929493900401349262859294019584,
a(25) = 11147809808065542806068516072966273546419446268999208919040,
a(26) = 2546290043518168376834989430543237695836588812241991243628544,
a(27) = 581602404180668450165151946330917571438380808408493632503515136,
a(28) = 132844786244917841301527538905934215543556848752364451671176863744,
a(29) = 30343301722280768281510520455705056105378106879356525016733484257280, and
a(n) = 188a(n-1) + 7998a(n-2) + 259876a(n-3) + 4850072a(n-4) + 22611752a(n-5)
- 292045860a(n-6) - 2811308992a(n-7) - 5710829000a(n-8) + 433981312a(n-9) + 78400774784a(n-10)
+ 212072291968a(n-11) + 563060463616a(n-12) + 1319709281280a(n-13) + 2571710809600a(n-14) + 902094094336a(n-15)
- 1347718762496a(n-16) - 6119057686528a(n-17) + 5645245612032a(n-18) + 24549642993664a(n-19) - 31793514283008a(n-20)
- 1125851856896a(n-21) - 5436031893504a(n-22) - 890735951872a(n-23) + 630487777280a(n-24) - 281320357888a(n-25).
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